I LOVED this game. The gravity mechanic was so much fun. I really loved the moment in the second to last level when you realize you can (and have to) use the gravity well for essentially infinite jumps. It makes navigating the last level really interesting as you feel like you unlocked your full movement potential.
My only piece of feedback is that the collision of the corners of the platforms should not have been rounded. It was kind of annoying slipping off the edges (which I did a lot in the beginning until I trained myself to work around it).
I also really enjoyed the pixel art. The flipping jump was really well done. Overall, I really enjoyed this game and I definitely would have played a longer version of it.