The best design levels of the game with a similar mecanic I have played so far.
The game is to short sadly but still is fun. The lenght also is great for encouraging speedruning.
I think the best thing to add would be to add collectibles like coins. The character feel also a bit to slipery but it can be fun for some people. The physic with balls rewinding is also extremelly weird but it is fun so I don't mind. If it was longer I could see it becoming one of my favorite entry of the jam. Good work !