This could maybe be my browsers fault, but the main feature, the music, sounded really jittery. I'm sorry if it is a bug. To rewind the music was nice as a mechanic, though I did not really see a change in gameplay through that. I liked that you did every single thing for the game on your own, thats hell of a lot of work! The gameplay otherwise felt really precise but the shooting could have a bit more impact. Maybe a camera shake would be nice! Overall I liked your game. The colors are really cool too :p