I really liked music, gameplay and style (lets assume its really cool), and my vote is sincerely 5/5, but I want to give a feedback on a strong disadvantage.
Your game is challenging, and in games like that you are dying 100 times before you beat the level. Meanwhile, you are getting used to the level, making your fingers and brain act perfectly to beat it. But you make the player to switch between levels, and that increase to play time exponentially.
I started to die on purpose on all levels except for one, after douzens tries. This feature looks like awesome at first, and it would be perfect if the game was not so challenging.