Very nice - is the art and music made from scratch just for this gamejam? If so i'm impressed.
Level design is great, except that there are no checkpoints. After the fourth try i just closed the game. Remember that in gamejams people have dozens of games to try so oftentimes they don't want to spend 15 minutes on a single game.
Also what ties this to the theme? The fact that there are "holes" between each level?