Overall, its an impressive game and I liked it. The characters are great, the rampup of the game is really good.
I had a couple of problems with this game. In the later levels (especially lvl5) the floating platforms are not evenly spaced. The problem with this is that its absolutely not visible in my opinion. Unless you learn how and when to jump on every platform it cannot be done. Its not a good design in my opinion, the player should be able to navigate the levels without memorizing it. There was a weird sideways push that I noticed during jumps. Not sure what happened there.
Apart from these annoyances I really enjoyed it, its great!