--- a/main.lua
+++ b/main.lua
@@ -209,12 +209,11 @@
     math.random() math.random()
 
     if love.load then love.load(arg) end
-    local dt = 0
 	local acc = 0
 
-    -- Main loop time.
-    while true do
-		local frame_start = love.timer.getTime()
+    -- One iteration per call: the browser build (love.js) calls the returned
+    -- function once per frame instead of running a blocking "while true" loop.
+    return function()
         -- Process events.
         if love.event then
             love.event.pump()
@@ -224,7 +223,7 @@
                         if love.audio then
                             love.audio.stop()
                         end
-                        return
+                        return a or 0
                     end
                 end
                 love.handlers[e](a,b,c,d)
@@ -232,8 +231,7 @@
         end
 
 		love.timer.step()
-		dt = love.timer.getDelta()
-		dt = math.min(dt, MAX_FRAMETIME)
+		local dt = math.min(love.timer.getDelta(), MAX_FRAMETIME)
 		acc = acc + dt
 
 		while acc >= MIN_FRAMETIME do
@@ -246,7 +244,6 @@
 		love.draw()
 
 		love.graphics.present()
-		love.timer.sleep(0.001)
     end
 end