The jump in this game is incredibly fun, with the precision power input coupled with the very real-feeling physics. The only complaint I have is that hitting the side of a platform just stops your X movement dead. It felt a bit off from a physics point of view, but also got a bit frustrating.
Other than that, I liked the graphics, and the character's animation is also really well done.
Overall, it's just a really fun and satisfying game. Well done!