Nice idea, fun game.
I have a few issues :
- I don't think hitting the side of a platform should kill the player, in the 2nd level it's very easy to die when trying to go fast.
- In the second level once I'm at the top (after 5-6 platforms maybe) I don't see where the next one is and I get killed. Why don't you show all the platform from the start?
- No sound? I know it's a 48h game but to me sounds are very important.