The art was cool, and the idea fits well with the jam's theme!
But I had a lot of trouble with the controls and general gameplay.
It was tough to react and change size to deal with enemies, especially when different types were close together.
The different sizes didn't intuitively align with the platforming. My solution ended up being to just supersize to get over everything. I also felt like in medium form, energy drained a little too fast.
So, there are some design problems to solve here regarding how you use your mechanics to make it fun. Overall, it was well executed and a good effort for the jam!