Looks like it works now!

compiled/radium.js

@@ -1670,7 +1670,6 @@ Sprite = (function() {
     this.image = image;
     this.getSize = __bind(this.getSize, this);
     this.draw = __bind(this.draw, this);
-    true;
     _ref = this.getSize(), this.width = _ref.width, this.height = _ref.height;
   }
 

radium/sprite.coffee

@@ -1,6 +1,5 @@
 class Sprite
 	constructor: (@engine, @name, @image) ->
-		true # Debugging
 		{width: @width, height: @height} = @getSize()
 		
 	draw: (x, y, options = {}, surface = "") =>