Use proper export

Basic2D/Resources/Scripts/main.js

@@ -1,11 +1,11 @@
-
 // This script is the main entry point of the game
 
-Atomic.player.loadScene("Scenes/Scene.scene");
-
+var scene = Atomic.player.loadScene("Scenes/Scene.scene");
 
-// called per frame
+// called per frame, optional
 function update(timeStep) {
 
 
 }
+
+exports.update = update;