At first I thought the game was too floaty, but I got used to it and it ended up being pretty fun. Had a few hard parts where if you let someone off at floor 5, then your weight goes down and you need to worry about slamming into the ceiling. Tough, but it seemed fair as I had no BS deaths once I figured things out. Also, I believe the volume slider isn't converted to log 10, or something along those lines. It didn't make things quieter, but it made them MUCH louder.
Of course, all the art is wonderful. I love all the little chibi art as well, no part of the game looked bad. Story was funny and fit the theme perfectly. I'd ask what you plan to add post-jam, but I already think the game is very good at what it's trying to do and can't think of much I'd want added. It was fun, was a nice challenge, and had a cute girl inflating. A+!