Fun game! Like some other people said the movement was a bit tricky (the air acceleration was very hard to control) and some music and some sound effects would go a long way to making the game feel more satisfying. Also, some particle effects on the jumps, maybe scaling based on how many jumps you had left or something, would add nice polish. Lastly, I think an end screen that appears when you destroy the bad guy in the end would make it clear that the game is finished and it isn't that hard to implement. Overall, good job!