diff --git a/scripts/actor.js b/scripts/actor.js
index d6353e8..c90a722 100644
--- a/scripts/actor.js
+++ b/scripts/actor.js
@@ -53,10 +53,6 @@ actor.delay.doc = `Call 'fn' after 'seconds' with 'this' set to the actor.`;
 actor.padawans = [];
 
 global.app = Object.create(actor);
-
-app.die = function()
-{
-  Game.quit();
-}
+app.die = function() { os.quit(); }
 
 return {actor, app};
diff --git a/scripts/debug.js b/scripts/debug.js
index 704d6d7..429bf90 100644
--- a/scripts/debug.js
+++ b/scripts/debug.js
@@ -48,7 +48,7 @@ var Debug = {
     if (this.draw_bb)
       Game.all_objects(function(x) { Debug.boundingbox(x.boundingbox(), Color.Debug.boundingbox.alpha(0.05)); });
 
-    if (Game.paused()) GUI.text("PAUSED", [0,0],1);
+    if (sim.paused()) GUI.text("PAUSED", [0,0],1);
 
     if (this.draw_gizmos)
       Game.all_objects(function(x) {
@@ -66,10 +66,10 @@ var Debug = {
       GUI.text(time.timecode(time.timenow() - Debug.Options.gif.start_time, Debug.Options.gif.fps), [0,30], 1);
     }
 
-    GUI.text(Game.playing() ? "PLAYING"
-                         : Game.stepping() ?
+    GUI.text(sim.playing() ? "PLAYING"
+                         : sim.stepping() ?
 			 "STEP" :
-			 Game.paused() ?
+			 sim.paused() ?
 			 "PAUSED; EDITING" : 
 			 "EDIT", [0, 0], 1);
   },
@@ -80,7 +80,7 @@ function assert(op, str)
   str ??= `assertion failed [value '${op}']`;
   if (!op) {
     console.error(`Assertion failed: ${str}`);
-    Game.quit();
+    os.quit();
   }
 }
 
@@ -141,6 +141,8 @@ Object.assign(profile, {
     fn();
     say(`profile [${str}]: ${profile.lap(start)}`);
   },
+
+  secs() { return this.now()/1000000000; },
 });
 
 
diff --git a/scripts/editor.js b/scripts/editor.js
index 6644635..1c6b55b 100644
--- a/scripts/editor.js
+++ b/scripts/editor.js
@@ -191,7 +191,7 @@ var editor = {
     this.stash = this.desktop.instance_obj();
     world.clear();
     global.mixin("config.js");
-    Game.play();
+    sim.play();
     player[0].uncontrol(this);
     player[0].control(limited_editor);
     editor.cbs.forEach(cb => cb());
@@ -206,7 +206,7 @@ var editor = {
   start_play() {
     world.clear();
     global.mixin("config.js");
-    Game.play();
+    sim.play();
     player[0].uncontrol(this);
     player[0].control(limited_editor);
     editor.cbs.forEach(cb=>cb());
@@ -217,7 +217,7 @@ var editor = {
   cbs: [],
 
   enter_editor() {
-    Game.pause();
+    sim.pause();
     player[0].control(this);
     player[0].uncontrol(limited_editor);
     
@@ -832,15 +832,15 @@ editor.inputs.f6 = function() { editor.start_play(); }
 editor.inputs.f6.doc = "Start game as if the player started it.";
 
 editor.inputs['M-p'] = function() {
-  if (Game.playing())
-    Game.pause();
+  if (sim.playing())
+    sim.pause();
 
-  Game.step();
+  sim.step();
 }
 editor.inputs['M-p'].doc = "Do one time step, pausing if necessary.";
 
 editor.inputs['C-M-p'] = function() {
-  if (!Game.playing()) {
+  if (!sim.playing()) {
     editor.start_play_ed();
   }
   console.warn(`Starting edited level ...`);
@@ -1928,9 +1928,7 @@ var groupsaveaspanel = Object.copy(inputpanel, {
 
 var quitpanel = Object.copy(inputpanel, {
   title: "really quit?",
-  action() {
-    Game.quit();
-  },
+  action() { os.quit(); },
   
   guibody () {
     return Mum.text({str: "Really quit?"});
@@ -2043,16 +2041,16 @@ limited_editor.inputs = {};
 
 limited_editor.inputs['C-p'] = function()
 {
-  if (Game.playing())
-    Game.pause();
+  if (sim.playing())
+    sim.pause();
   else
-    Game.play();
+    sim.play();
 }
 
 limited_editor.inputs['M-p'] = function()
 {
-  Game.pause();
-  Game.step();
+  sim.pause();
+  sim.step();
 }
 
 limited_editor.inputs['C-q'] = function()
@@ -2072,7 +2070,7 @@ if (io.exists("editor.config"))
   load_configs("editor.config");
 
 /* This is the editor level & camera - NOT the currently edited level, but a level to hold editor things */
-Game.stop();
+sim.pause();
 Window.editor = true;
 Debug.draw_phys(true);
 
diff --git a/scripts/engine.js b/scripts/engine.js
index c0ae893..8ecb397 100644
--- a/scripts/engine.js
+++ b/scripts/engine.js
@@ -143,10 +143,47 @@ var load = use;
 Object.assign(global, use("scripts/base.js"));
 global.obscure('global');
 global.mixin("scripts/render.js");
+global.mixin("scripts/debug.js");
+
+var frame_t = profile.secs();
+var updateMS = 1/60;
+var physMS = 1/60;
+
+var sim = {
+  mode: "play",
+  play() { this.mode = "play"; os.reindex_static(); },
+  playing() { return this.mode === 'play'; },
+  pause() { this.mode = "pause"; console.stack(); },
+  paused() { return this.mode === 'pause'; },
+  step() { this.mode = 'step'; },
+  stepping() { return this.mode === 'step'; }
+}
+
+var physlag = 0;
+var timescale = 1;
 
 function process()
 {
-  say ('holy cow');
+  var dt = profile.secs() - frame_t;
+  frame_t = profile.secs();
+  
+  prosperon.appupdate(dt);
+  prosperon.emitters_step(dt);
+  
+  if (sim.mode === "play" || sim.mode === "step") {
+    prosperon.update(dt*game.timescale);
+    if (sim.mode === "step")
+      sim.pause();
+  }
+  
+  physlag += dt;
+  
+  while (physlag > physMS) {
+    physlag -= physMS;
+    prosperon.phys2d_step(physMS*timescale);
+    prosperon.physupdate(physMS*timescale);
+  }
+  prosperon.window_render();
 }
 
 global.Game = {
@@ -178,18 +215,6 @@ global.Game = {
 
   },
 
-  quit() {
-    sys_cmd(0);
-  },
-
-  pause() { sys_cmd(3); },
-  stop() { Game.pause(); },
-  step() { sys_cmd(4);},
-  playing() { return sys_cmd(5); },
-  paused() { return sys_cmd(6); },
-  stepping() { return cmd(79); },
-  play() { sys_cmd(1); },
-  
   wait_fns: [],
 
   wait_exec(fn) {
@@ -349,8 +374,8 @@ var Register = {
   },
 };
 
-Register.add_cb("update").doc = "Called once per frame.";
 Register.add_cb("appupdate");
+Register.add_cb("update").doc = "Called once per frame.";
 Register.add_cb("physupdate");
 Register.add_cb("gui");
 Register.add_cb("debug");
@@ -405,7 +430,7 @@ Window.world2screen = function(worldpos) {
 Window.icon = function(path) { cmd(90, path); };
 Window.icon.doc = "Set the icon of the window using the PNG image at path.";
 
-global.mixin("scripts/debug.js");
+
 global.mixin("scripts/spline.js");
 global.mixin("scripts/components.js");
 
@@ -453,3 +478,4 @@ Game.view_camera = function(cam)
 }
 
 Window.title = `Prosperon v${prosperon.version}`;
+Window.size = [500,500];
diff --git a/scripts/entity.js b/scripts/entity.js
index 0f83f1c..f515839 100644
--- a/scripts/entity.js
+++ b/scripts/entity.js
@@ -362,7 +362,7 @@ var gameobject = {
 
 
     if (typeof ent.load === 'function') ent.load();
-    if (Game.playing())
+    if (sim.playing())
       if (typeof ent.start === 'function') ent.start();
 
     var mur = ent.get_ur();
@@ -838,4 +838,4 @@ Game.loadurs = function() {
 
 return {
   gameobject
-}
\ No newline at end of file
+}
diff --git a/scripts/test.js b/scripts/test.js
index 13b5cb3..c627836 100644
--- a/scripts/test.js
+++ b/scripts/test.js
@@ -35,4 +35,4 @@ say(`Failed tests are:`);
 for (var f of failed)
   say(f);
   
-Game.quit();
+os.quit();
diff --git a/source/engine/2dphysics.c b/source/engine/2dphysics.c
index 3fcf2bb..a993de3 100644
--- a/source/engine/2dphysics.c
+++ b/source/engine/2dphysics.c
@@ -1,6 +1,5 @@
 #include "2dphysics.h"
 
-#include "debug.h"
 #include "gameobject.h"
 #include <string.h>
 
diff --git a/source/engine/debug/debug.c b/source/engine/debug/debug.c
deleted file mode 100644
index 25f50f8..0000000
--- a/source/engine/debug/debug.c
+++ /dev/null
@@ -1,45 +0,0 @@
-#include "debug.h"
-
-#include "stb_ds.h"
-#include "log.h"
-#include "sokol/sokol_time.h"
-
-unsigned long long triCount = 0;
-
-void prof_start(struct d_prof *prof)
-{
-  arrsetlen(prof->ms, prof->laps);
-}
-
-void prof_reset(struct d_prof *prof)
-{
-  prof->lap = stm_now();
-}
-
-float prof_lap_avg(struct d_prof *prof)
-{
-  float avg;
-  for (int i = 0; i < arrlen(prof->ms); i++)
-    avg += prof->ms[i];
-
-  avg /= arrlen(prof->ms);
-  return avg;
-}
-
-void prof_lap(struct d_prof *prof)
-{
-  if (prof->ms == NULL)
-    prof_start(prof);
-    
-  if (arrlen(prof->ms) >= prof->laps) {
-    YughWarn("Profiled time of %s is avg %g", prof->name, prof_lap_avg(prof));
-    arrsetlen(prof->ms, 0);
-  }
-  uint64_t t = stm_since(prof->lap);
-  arrput(prof->ms, stm_sec(t));
-}
-
-void resetTriangles()
-{
-  triCount = 0;
-}
diff --git a/source/engine/debug/debug.h b/source/engine/debug/debug.h
deleted file mode 100644
index 1c186bc..0000000
--- a/source/engine/debug/debug.h
+++ /dev/null
@@ -1,20 +0,0 @@
-#ifndef DEBUG_GUI_H
-#define DEBUG_GUI_H
-
-#include <stdint.h>
-
-struct d_prof {
-  char *name;
-  float *ms;
-  uint64_t lap;
-  int laps;
-};
-
-extern unsigned long long triCount;
-void resetTriangles();
-void prof_start(struct d_prof *prof);
-void prof_reset(struct d_prof *prof);
-void prof_lap(struct d_prof *prof);
-float prof_lap_avg(struct d_prof *prof);
-
-#endif
diff --git a/source/engine/debug/debugdraw.c b/source/engine/debug/debugdraw.c
index ef8aad9..d4af277 100644
--- a/source/engine/debug/debugdraw.c
+++ b/source/engine/debug/debugdraw.c
@@ -4,7 +4,6 @@
 #include "yugine.h"
 #include "log.h"
 #include <assert.h>
-#include "debug.h"
 #include "window.h"
 #include "2dphysics.h"
 #include "stb_ds.h"
diff --git a/source/engine/input.h b/source/engine/input.h
index 30229be..70ef761 100644
--- a/source/engine/input.h
+++ b/source/engine/input.h
@@ -18,8 +18,4 @@ void touch_cancelled(sapp_touchpoint *touch, int n);
 void input_dropped_files(int n);
 void input_clipboard_paste(char *str);
 
-const char *keyname_extd(int key);
-
-void quit();
-
 #endif
diff --git a/source/engine/jsffi.c b/source/engine/jsffi.c
index 5b10d7c..d8a554a 100644
--- a/source/engine/jsffi.c
+++ b/source/engine/jsffi.c
@@ -3,8 +3,6 @@
 #include "script.h"
 
 #include "anim.h"
-#include "timer.h"
-#include "debug.h"
 #include "debugdraw.h"
 #include "font.h"
 #include "gameobject.h"
@@ -206,8 +204,6 @@ JSValue ptr2js(void *ptr) {
   return obj;
 }
 
-struct timer *js2timer(JSValue v) { return id2timer(js2int(v)); }
-
 double js_get_prop_number(JSValue v, const char *p) {
   double num;
   JS_ToFloat64(js, &num, js_getpropstr(v,p));
@@ -758,10 +754,6 @@ JSValue duk_cmd(JSContext *js, JSValueConst this, int argc, JSValueConst *argv)
     set_cat_mask(js2int(argv[1]), js2bitmask(argv[2]));
     break;
 
-  case 79:
-    ret = JS_NewBool(js, phys_stepping());
-    break;
-
   case 80:
     ids = phys2d_query_shape(js2ptr(argv[1]));
     ret = gos2ref(ids);
@@ -1114,37 +1106,6 @@ JSValue duk_register_collide(JSContext *js, JSValueConst this, int argc, JSValue
   return JS_UNDEFINED;
 }
 
-JSValue duk_sys_cmd(JSContext *js, JSValueConst this, int argc, JSValueConst *argv) {
-  int cmd = js2int(argv[0]);
-
-  switch (cmd) {
-  case 0:
-    quit();
-    break;
-
-  case 1:
-    sim_start();
-    cpSpaceReindexStatic(space);
-    break;
-
-  case 3:
-    sim_pause();
-    break;
-
-  case 4:
-    sim_step();
-    break;
-
-  case 5:
-    return JS_NewBool(js, sim_playing());
-
-  case 6:
-    return JS_NewBool(js, sim_paused());
-  }
-
-  return JS_UNDEFINED;
-}
-
 JSValue duk_make_gameobject(JSContext *js, JSValueConst this, int argc, JSValueConst *argv) {
   return gameobject2js(MakeGameobject());
 }
@@ -1465,6 +1426,9 @@ JSValue js_os_sys(JSContext *js, JSValueConst this, int argc, JSValue *argv)
   return JS_UNDEFINED;
 }
 
+JSValue js_os_quit(JSContext *js, JSValueConst this) { quit(); return JS_UNDEFINED; }
+JSValue js_os_reindex_static(JSContext *js, JSValueConst this) { cpSpaceReindexStatic(space); return JS_UNDEFINED; }
+
 static const JSCFunctionListEntry js_os_funcs[] = {
   MIST_FUNC_DEF(os, cwd, 0),
   MIST_FUNC_DEF(os, env, 1),
@@ -1481,14 +1445,28 @@ JSValue global_get_##ENTRY (JSContext *js, JSValue this) { \
   return TYPE##2js(ENTRY); \
 } \
 
-GETSET_GLOBAL(physMS, number)
-GETSET_GLOBAL(timescale, number)
-GETSET_GLOBAL(updateMS, number)
+JSValue js_prosperon_emitters_step(JSContext *js, JSValue this, int argc, JSValue *argv)
+{
+  emitters_step(js2number(argv[0]));
+  return JS_UNDEFINED;
+}
+
+JSValue js_prosperon_phys2d_step(JSContext *js, JSValue this, int argc, JSValue *argv)
+{
+  phys2d_update(js2number(argv[0]));
+  return JS_UNDEFINED;
+}
+
+JSValue js_prosperon_window_render(JSContext *js, JSValue this, int argc, JSValue *argv)
+{
+  window_render(&mainwin);
+  return JS_UNDEFINED;
+}
 
 static const JSCFunctionListEntry js_prosperon_funcs[] = {
-  CGETSET_ADD(global, updateMS),
-  CGETSET_ADD(global, physMS),
-  CGETSET_ADD(global, timescale),
+  MIST_FUNC_DEF(prosperon, emitters_step, 1),
+  MIST_FUNC_DEF(prosperon, phys2d_step, 1),
+  MIST_FUNC_DEF(prosperon, window_render, 0)
 };
 
 JSValue js_time_now(JSContext *js, JSValue this) {
@@ -1547,11 +1525,9 @@ static const JSCFunctionListEntry js_console_funcs[] = {
 };
 
 JSValue js_profile_now(JSContext *js, JSValue this) { return number2js(stm_now()); }
-JSValue js_profile_fps(JSContext *js, JSValue this) { return number2js(frame_fps()); }
 
 static const JSCFunctionListEntry js_profile_funcs[] = {
   MIST_FUNC_DEF(profile,now,0),
-  MIST_FUNC_DEF(profile,fps,0)
 };
 
 JSValue js_io_exists(JSContext *js, JSValueConst this, int argc, JSValue *argv)
@@ -1780,15 +1756,12 @@ static JSValue window_get_title(JSContext *js, JSValueConst this, JSValue v)
   return str2js(js2window(this)->title);
 }
 
-GETSET_PAIR(window, editor, bool)
-
 static const JSCFunctionListEntry js_window_funcs[] = {
   CGETSET_ADD(window, size),
   CGETSET_ADD(window, rendersize),
   CGETSET_ADD(window, mode),
   CGETSET_ADD(window, fullscreen),
   CGETSET_ADD(window, title),
-  CGETSET_ADD(window, editor)
 };
 
 #define GETSET_PAIR_BODY(ID, ENTRY, TYPE) \
@@ -2020,7 +1993,6 @@ void ffi_load() {
   DUK_FUNC(make_gameobject, 0)
   DUK_FUNC(set_body, 3)
   DUK_FUNC(q_body, 2)
-  DUK_FUNC(sys_cmd, 1)
   DUK_FUNC(spline_cmd, 6)
   DUK_FUNC(make_circle2d, 1)
   DUK_FUNC(cmd_circle2d, 6)
diff --git a/source/engine/sound/sound.c b/source/engine/sound/sound.c
index 8ca8cb8..e0527ba 100644
--- a/source/engine/sound/sound.c
+++ b/source/engine/sound/sound.c
@@ -8,7 +8,6 @@
 #include "time.h"
 #include <stdlib.h>
 #include "pthread.h"
-#include "debug.h"
 #include "jsffi.h"
 
 pthread_mutex_t soundrun = PTHREAD_MUTEX_INITIALIZER;
diff --git a/source/engine/sprite.c b/source/engine/sprite.c
index 0592af1..f6193a1 100644
--- a/source/engine/sprite.c
+++ b/source/engine/sprite.c
@@ -5,7 +5,6 @@
 #include "render.h"
 #include "stb_ds.h"
 #include "texture.h"
-#include "timer.h"
 #include "HandmadeMath.h"
 
 #include "sprite.sglsl.h"
diff --git a/source/engine/thirdparty/quickjs/quickjs.c b/source/engine/thirdparty/quickjs/quickjs.c
index 07b3eac..dac19ce 100644
--- a/source/engine/thirdparty/quickjs/quickjs.c
+++ b/source/engine/thirdparty/quickjs/quickjs.c
@@ -112,7 +112,6 @@ void quickjs_set_dumpout(FILE *f)
 //#define DUMP_READ_OBJECT
 
 #ifdef DUMP
-#define DUMP_FREE
 #define DUMP_CLOSURE
 #define DUMP_GC
 #define DUMP_GC_FREE
diff --git a/source/engine/timer.c b/source/engine/timer.c
deleted file mode 100644
index 2bd4043..0000000
--- a/source/engine/timer.c
+++ /dev/null
@@ -1,100 +0,0 @@
-#include "timer.h"
-#include "log.h"
-#include <stdlib.h>
-
-#include <stb_ds.h>
-#include "script.h"
-
-struct timer *timers;
-static int first = -1;
-
-void check_timer(struct timer *t, double dt) {
-  if (!t->on)
-    return;
-
-  t->remain_time -= dt;
-
-  if (t->remain_time <= 0) {
-    t->cb(t->data);
-    if (t->repeat) {
-      t->remain_time = t->interval;
-      return;
-    }
-
-    timer_pause(t);
-    return;
-  }
-}
-
-void timer_update(double dt, double scale) {
-  double sdt = dt*scale;
-  for (int i = 0; i < arrlen(timers); i++)
-    if (timers[i].app)
-      check_timer(&timers[i], dt);
-    else
-       check_timer(&timers[i], sdt);
-}
-
-int timer_make(double interval, void (*callback)(void *param), void *param, int own, int app) {
-  struct timer new;
-  new.remain_time = interval;
-  new.interval = interval;
-  new.cb = callback;
-  new.data = param;
-  new.repeat = 1;
-  new.owndata = own;
-  new.next = -1;
-  new.app = app;
-
-  if (first < 0) {
-    timer_start(&new);
-    arrput(timers, new);
-    return arrlen(timers) - 1;
-  } else {
-    int retid = first;
-    first = id2timer(first)->next;
-    *id2timer(retid) = new;
-    timer_start(id2timer(retid));
-    return retid;
-  }
-}
-
-void timer_pause(struct timer *t) {
-  if (!t->on) return;
-  t->on = 0;
-}
-
-void timer_stop(struct timer *t) {
-  if (!t->on) return;
-  t->on = 0;
-  t->remain_time = t->interval;
-}
-
-void timer_start(struct timer *t) {
-  if (t->on) return;
-  t->on = 1;
-}
-
-void timer_remove(int id) {
-  struct timer *t = id2timer(id);
-//  free_callee(t->data);
-  t->next = first;
-  t->on = 0;  
-  first = id;
-}
-
-void timerr_settime(struct timer *t, double interval) {
-  t->remain_time += (interval - t->interval);
-  t->interval = interval;
-}
-
-struct timer *id2timer(int id) {
-  return &timers[id];
-}
-
-void timers_free()
-{
-//  for (int i = 0; i < arrlen(timers); i++)
-//    if (timers[i].on)
-//      free_callee(timers[i].data);
-}
diff --git a/source/engine/timer.h b/source/engine/timer.h
deleted file mode 100644
index d4580fb..0000000
--- a/source/engine/timer.h
+++ /dev/null
@@ -1,29 +0,0 @@
-#ifndef TIMER
-#define TIMER
-
-struct timer {
-    int timerid;
-    int on;
-    
-    double interval; // Time of timer
-    int repeat;
-    double remain_time;   // How much time until the timer executes
-    void (*cb)(void *data);
-    void *data;
-    int owndata;
-    int next;
-  int app; /* True if this timer is an "app" timer, and should always update; otherwise, only update with game time */
-};
-
-int timer_make(double interval, void (*callback)(void *param), void *param, int own, int app);
-struct timer *id2timer(int id);
-void timer_remove(int id);
-void timer_start(struct timer *t);
-void timer_pause(struct timer *t);
-void timer_stop(struct timer *t);
-void timer_update(double dt, double scale);
-void timerr_settime(struct timer *t, double interval);
-
-void timers_free();
-
-#endif
diff --git a/source/engine/window.h b/source/engine/window.h
index fdb782e..a08121e 100644
--- a/source/engine/window.h
+++ b/source/engine/window.h
@@ -20,7 +20,6 @@ struct window {
   int focus;
   int shown;
   int mode;
-  int editor; // true if only should redraw on input
   float aspect;
   float raspect;
   char *title;
@@ -35,7 +34,6 @@ void window_focused(int focus);
 void window_iconified(int s);
 void window_suspended(int s);
 
-
 void window_apply(window *w);
 void window_free(window *w);
 
diff --git a/source/engine/yugine.c b/source/engine/yugine.c
index 0921137..ad07492 100644
--- a/source/engine/yugine.c
+++ b/source/engine/yugine.c
@@ -1,7 +1,5 @@
 #include "yugine.h"
-#include "font.h"
 #include "transform.h"
-#include "gameobject.h"
 #include "input.h"
 #include "render.h"
 #include "window.h"
@@ -14,7 +12,6 @@
 
 #include "datastream.h"
 
-#include "timer.h"
 #include "quickjs/quickjs.h"
 
 #include "jsffi.h"
@@ -52,27 +49,9 @@
 #include "stb_image_write.h"
 #include <pl_mpeg.h>
 
-#include "debug.h"
-
-static struct d_prof prof_draw;
-static struct d_prof prof_update;
-static struct d_prof prof_input;
-static struct d_prof prof_physics;
-
-double physlag = 0;
-double physMS = 1 / 60.f;
-uint64_t physlast = 0;
-
-double updateMS = 1/60.f;
-uint64_t updatelast = 0;
-
-static int phys_step = 0;
-
 uint64_t start_t;
 uint64_t frame_t;
 
-double timescale = 1.f;
-
 #define SIM_PLAY 0
 #define SIM_PAUSE 1
 #define SIM_STEP 2
@@ -83,11 +62,11 @@ static int argc;
 static char **args;
 
 static JSValue c_init_fn;
-
 static JSValue c_process_fn;
 
 void c_init() {
   mainwin.start = 1;
+  window_resize(sapp_width(), sapp_height());
   script_evalf("world_start();");
   render_init();
   window_set_icon("icons/moon.gif");  
@@ -97,53 +76,7 @@ void c_init() {
     script_call_sym(c_init_fn,0,NULL);
 }
 
-int frame_fps() { return 1.0/sapp_frame_duration(); }
-
-static void process_frame()
-{
-  script_call_sym(c_process_fn,0,NULL);
-  double elapsed = stm_sec(stm_laptime(&frame_t));
-  script_evalf("prosperon.appupdate(%g);", elapsed);
-  /* Timers all update every frame - once per monitor refresh */
-  timer_update(elapsed, timescale);
-
-  emitters_step(elapsed);
-
-  if (sim_play == SIM_PLAY || sim_play == SIM_STEP) {
-    if (stm_sec(stm_diff(frame_t, updatelast)) > updateMS) {
-      double dt = stm_sec(stm_diff(frame_t, updatelast));
-      updatelast = frame_t;
-      
-//      prof_start(&prof_update);
-      script_evalf("prosperon.update(%g);", dt*timescale);
-//      prof_lap(&prof_update);
-
-      if (sim_play == SIM_STEP)
-        sim_pause();
-    }
-
-    physlag += elapsed;
-    while (physlag > physMS) {
-      physlag -= physMS;
-//      prof_start(&prof_physics);
-      phys_step = 1;
-      phys2d_update(physMS * timescale);
-      script_evalf("prosperon.physupdate(%g);", physMS*timescale);
-      phys_step = 0;
-//      prof_lap(&prof_physics);
-    }
-  }
-
-//    prof_start(&prof_draw);
-    window_render(&mainwin);
-//    prof_lap(&prof_draw);
-}
-
-void c_frame()
-{
-  if (mainwin.editor) return;
-  process_frame();
-}
+void c_frame() { script_call_sym(c_process_fn,0,NULL); }
 
 void cleanup()
 {
@@ -252,18 +185,8 @@ void c_event(const sapp_event *e)
     default:
       break;
   }
-
-  if (mainwin.editor)
-    process_frame();
 }
 
-int sim_playing() { return sim_play == SIM_PLAY; }
-int sim_paused() { return sim_play == SIM_PAUSE; }
-void sim_start() { sim_play = SIM_PLAY; }
-void sim_pause() { sim_play = SIM_PAUSE; }
-int phys_stepping() { return sim_play == SIM_STEP; }
-void sim_step() { sim_play = SIM_STEP; }
-
 static sapp_desc start_desc = {
     .width = 720,
     .height = 1080,
@@ -290,8 +213,6 @@ int main(int argc, char **argv) {
   signal(SIGSEGV, seghandle);
   signal(SIGABRT, seghandle);
   signal(SIGFPE, seghandle);
-//  signal(SIGBUS, seghandle);
-
 #endif
 
   resources_init();
@@ -328,8 +249,6 @@ void engine_start(JSValue fn, JSValue procfn)
   c_init_fn = fn;
   c_process_fn = procfn;
 
-  start_t = frame_t = stm_now();
-  physlast = updatelast = start_t;
   sound_init();
   phys2d_init();  
 
@@ -340,7 +259,7 @@ void engine_start(JSValue fn, JSValue procfn)
   sapp_run(&start_desc);
 }
 
-double apptime() { return stm_sec(stm_diff(stm_now(), start_t)); }
+double apptime() { return stm_sec(stm_now()); }
 
 void quit() {
   if (mainwin.start)
diff --git a/source/engine/yugine.h b/source/engine/yugine.h
index 7e76005..4df9297 100644
--- a/source/engine/yugine.h
+++ b/source/engine/yugine.h
@@ -3,22 +3,11 @@
 
 #include "script.h"
 
-int sim_playing();
-int sim_paused();
-void sim_start();
-void sim_pause();
-void sim_stop();
-void sim_step();
-int phys_stepping();
+double apptime();
 void print_stacktrace();
 void engine_start(JSValue fn, JSValue proc_fn); /* fn runs after the engine starts */
 
-int frame_fps();
 void quit();
 
-double apptime();
-extern double timescale;
-extern double renderMS;
-extern double physMS;
-extern double updateMS;
+
 #endif