This is a fun, casual game that follows the theme really well. You designed the levels to fully show the extent of the mechanics you implemented. Also, great job on making all of the art and music yourself, they really compliment each other nicely.
I found a bug that when you spam the "u" button while rewinding, all sorts of weird things start to happen. I understand that it was a game jam game though, and these small bugs can be overlooked, especially when they can be easily avoided by the player.