Great jam game, can't believe you made it in 48 hours! Overall it's very cohesive, and the main mechanic is fun and engaging. I liked the music as well, how it comes in at the start and how it switched for the different sections. And the little sounds, pops and when you die are great.
I agree with the other reviews that the jump is a bit hard, it seems to vary quite a lot based on the run up in a not so intuitive way, and I also didn't realise til quite late on that the beige surface is a lot better for jumping on! I struggled to move the big blocks until I realised you could gain speed as a small ball, then quickly go big to have the force of the big ball with the speed of the small one - this is a really cool trick, and maybe a tutorial for it would have been good.
Good job!