Easily one of the best entries in the jam! You very clearly focused on one game mechanic, and you explored it in some interesting and unexpected ways.
I especially love the area where you expect to fall all the way down to the checkpoint, but gravity switches before you can do that, and you have to notice that there are little nooks and crannies to hide in while the gravity switches so you can make it all the way to bottom.
To have an insight like that requires a special kind of perceptiveness about the systems in your game, and it is a rare quality in game designers.
That's not to mention all of the other things we would normally expect like solid crisp controls, catchy music, great art, all of it fit to a theme.
If this doesn't win, it should at least be top ten.