The game controls well, with some somewhat buggy interactions like being able to float by using the pump or move through walls. Those can actually be used to your advantage since some older games had plenty of quirks like those in them. I feel like you should be able to use the inflated enemies for something, either rolling them or jumping on them perhaps?
The characters are neat, but the background is a bit too clashingly bright on the eyes. The inflation, deflation, and explosion animations are very nicely done! Sound effects are usually an important part of inflation themed games, adding a few rubbery noises could dramatize the action. The original soundtrack fits the tone of the game really well and I was surprised by how varied the title screen loop becomes if you stay on it too long!