What a cool little game! :D I really love the feeling this game generated. Great job with the camera shakes. It adds a certain level of 'umph' to the hits, and I think that's a good umph xD
I completed it very quickly, maybe some improvements could be more/longer levels? To add these I also feel like maybe implementing a few "gimmicks" could ease the repetition.
Solid game dude, nice!