Great work! I think rotating the gravity upside down and back was a great. I liked the level design in the first few levels especially, where you could get to the end in multiple ways and how it highlighted being able to change gravity direction in the air. A couple things I might suggest changing is the noise for jumping, it's a little harsh sounding in my opinion, and some of the levels start with an enemy right at the start, which can be difficult to avoid. That said, I think the game was really fun and I enjoyed playing through it. Great work!