The concept is classical, but I liked the "mirrored" level that added a twist to that. Overall, it's a nice little game, good job!
I have two little nitpicks =). The first one is about the jump: it is a bit frustrating to not be able to jump when nearly dropping from a block. I guess the collision detection for the ground doesn't detect the very edge of the character =p. The second one is about the level design: it's not a good idea to kill the player right when he spawns in a level. The beginning of a level is normally supposed to be a free zone were the player can analyze what he must do ^^.
But overall, that's a nice attempt, and there are a lot of levels for a jam game, so congratulations =)