Great job on this one. I wouldn't be surprised if this game wins the jam. The level design is terrific as well as the audio. Also, you get points for the completeness of the game. Of course, I do have some nitpicking comments.
- The controls are not very tight. Everything seems to move in fast-forward, and it makes the platforming artificially difficult.
- The graphics are good for what they are, but since they are mostly copied from Mario, I can not give a high rating. The main character model and some others are nice though.
Btw, whoever decided to make the guy explode into gory bits whenever you lose a life, I commend you.