I can proudly say I saved Inflato Island! A great short experience, but also quite challenging. It took me a while to beat the first level.
A few things that came to my mind: I would appreciate a few checkpoints, especially when learning the game in the first level so I don't have to start from the beginning all the time. Also sometimes the hitboxes feel a little unforgiving when it comes to coming close to spikes. And I once encountered 3 enemies in a row, jumped over the first and deflated and killed the second one, but died anyway, because I hit the first one on top - I think. Not sure if that is intended, but it somehow didn't feel right in the moment. When it comes to the deflation mechanic, I don't know how it should behave, because when I deflate and don't press a direction key, I sometimes have forward momentum and sometimes I don't. When I do that momentum alone isn't enough to kill enemies or hurt the boss and I additionally have to press a forward button, which is the intended way I would guess. It feels weird if I can deflate through an enemy without anything happen to it.
You made great game with a really creative way to implement the scaling mechanic into a platformer :D I really had some fun trying to beat the boss. The deflating mechanic is very funny and fun to use