Okay so: I love the presentation, the colors and everything. I think it misses a score of some kind this being a game about a DJ!
I like the energy, the fun factor and the use of the rewind as a "super hot" catchphrase of sorts, maybe not super innovative but at least it's fun to play and I played all the way through.
You say it's your first game jam, you've done a bang up job!
If you're in the market for a puzzle platformer, check out my game as well!