Art & sound are great. Because the controls change very often, I think a screen overlay indicating what keys invoke what movement/action will be great addition to the game. In a game where controls are part of gameplay, we should consider some players will think something like: "I don't have time figuring out what my controls are, if can't figure it out within ten seconds, I'm quitting". I believe you could improve it somehow other than adding an overlay screen. I don't think I'm quite enjoying the game because it's messing with the controls so much, truly chaotic!