I thought this was a good platformer with a lot of potential to be expanded upon! You introduced some nice concepts, the gravity switching and the black/white holes, and gave them some narrative grounding - I think these could make for some insanely cool levels in a full game. The pixel art and lighting in this game is gorgeous, I really love what you did with it. I think for such an atmospheric game, some music and sound effects could have gone a long way. Some of the levels that use momentum to launch you, such as the tree level, were rather unintuitive and tough to figure out how to do. I also think it would have been nice to see a visual and narrative transition into new areas (I wasn't really sure why we went to the black/white hole void after leaving the broken city), and a bit more narrative context for why the game looped back around to the beginning would have been nice. Great job, I think this could be a basis for a full on game at some point!