I made a simple template project on how to structure your code in multiple files. View it here: https://github.com/bluePlayer/practices/tree/master/Phaser2Structure Additionally I created some helper functions to aid my self in development, you could find them useful too... Things I would like to see in Phaser 2.3 or Phaser 3 are: 1. Asset key store where we could save keys of our assets and access them using just the name of the key, like a constant. Check the code there is a whole code about it. 2. Each game state should have KEY property holding the name of the State. 3. Additional functionality for transition between states, for example (fade out-fade in) or checker board or bubbles or whatever. Just a thought. I had to use Tween and hold all state objects in a group to fade them. 4. Maybe some support for GPGS or other scoreboard system if any. Just a thought. I used the same code to build my APK file so there weren't changes and it worked on device. Let me know your thoughts on the code.