Really cool! :)
It's a bit difficult (although in a kinda fun I-almost-had-it-gah-why-am-I-so-stupid kind of way). Art could use a little improvement, and there's no sound or music. And a way to skip through the game over screen faster would be nice since you see it so often. Instructions could also be clearer (it took me way longer than it should have to figure out the level select screen). Most importantly though, it's fun to play!
So for a game jam 5/5. :)