Oh man, this game is quite hard! :D I'm already stuck on the fourth level... It looks really nice though, the level design and all the effects/colors provide a brilliant game design.
The game in general feels really polished and there are no areas which seem to be lacking anything important.
I'd suggest (maybe) improving the controls a bit and make them swifter/smoother so that you can control your cube better and not die as often ^_^
Awesome job! I'd definitely like seeing another nice project by you ;)