Cute little physics (literally!) platformer. The platforming felt pretty good, and the music was charming and felt fitting.
It would have been cool if you had expanded on the magnet idea. For example, I sort of expected the opposite magnet blocks to let you stick to their underside if you jumped/bounced into one from below. Also, a level transition of some sort, or even just a brief pause when you win would have made success a bit less jarring :)
I hope you keep working on this after the jam; a few more mechanics and deeper puzzles would make this a very fun game!