Firstly congrats on making a game for the jam. It's a hard thing to do in the time allocated, and you've done a good job. The music is fun and everything moves a at a quick pace.
I agree with Case. though. Especially in a game where you put such a tight time limit on the player, to have to spend time looking at the level first to see what you can jump on kills the momentum. Also the other thing is the difficulty. It's pretty tough, and the time limit is so short. In a jam it's hard to get that balance right, and to please everyone though.
All up, a cool game and a nice job.