Absolutely epic. loved everything about it. I have some suggestions.
1: rolling. hold shift to roll up into a ball (bigger ball at bigger sizes) you cant control the ball but it has a much higher top speed than normal movement (like in classic sonic games)
2: KEEP the Pool Rooms aesthetic. it looks great, fits the idea of random pools (to regain mass). also- I'd suggest watching this video for possible aesthetic inspiration on further levels if you intend on making this into a full game. (yes its a minecraft tuber im not trying to promote him or anything i just think his verison of the pool rooms looks cool)