Very nice idea, very well executed.
I loved the way the first level starts and the fact that you can actually rewind chrono guy out of the screen again.
From my point of view, what it is lacking is some polish but that has already been commented below (mostly regarding player movement), but that is easily understandable in a game jam. I actually find it hilarious that you have a super cool death animation but no walking one...
After reading a few of your comments on other games, I'm actually sorry to not have a more constructive comment to write :(
Good job and keep making games!