Absolutely stunning idea! Incredible concept, and a massive undertaking for a 48 hour project.
The level design was understandably a little rough due to the size and scope, but really well done nevertheless. Main critiques from a mechanical standpoint would be the clipping into other objects when flipping. Think there should maybe have been some sort of additional mechanic to somehow prevent that, though of course it would be a big technical challenge.
Slightly more in-game motivation towards the goal would also have been nice, something as simple as a cutscene at the base of the island panning to the peak would have sufficed for instance.
And of course, as others have mentioned, the controls were a bit touch and go, but I won't harp on that.