Really enjoyed this one. Simple idea but very convincing, with enough strategy in it to keep me hooked for a while. Also one of the best ones I've played in terms of the jam's theme.
Only constructive comment I can think of is that I would have liked a bit more variety in the music (or a longer loop at least), it can get a bit repetitive after a while.
Btw, is there an end? If so, how many levels? (if that's not too much of a spoiler). I died on level 11 but I'm sure I can do better. :)