Hi, thanks for playing. The bug with the fullscreen is something I've been aware of for some time. I'm not sure what's causing it. I don't know how much we can tweak the physics currently, but I am planning to make some adjustments. I do agree that this game is probably better suited for a controller. I do plan on integrating full controller support, it just wasn't ready for the demo release. I do also plan to have much easier levels, right now the plan is to have about 20-25 levels, and the ones in this demo will probably be later in the game than they are now. The tutorial will also be overhauled to better teach the player how to play the game. Thank you for the kind words.