Very simple graphics ... let's say: reduced to the max =)
But I really like the level design and the different challenges. And there are a LOT of levels for a game jam. Well done!
Took me a while to figure out that, sometimes, you have to sacrifice *something* to progress. An interesting gameplay design.
What about improving the controller a bit? The jump is not 100% reliable on my machine. And it was most of the time fatal =)
Had a lot of fun with it! Congrats on your submission.