Great SFX!!! Though you should try and implement the theme in a different way, and make the level longer, and add checkpoints, after the jam. Also here are some ideas on how to implement the theme even more:
1. Trick the player into thinking that he needs to get to the end of the level. That's what I did for my game.
2. Every time you die, give the player a tiny boost in speed or jump height.
Thank you!!!