Super fun game! I really enjoyed the physics mechanics and that the ball felt like it had a real weight to it. However, I had some issues regarding double jump often not triggering (I see in your comments that this is due to ceiling height, but I think that is a bit unclear in the game) and being able to see outside the map when jumping too lose to the ceiling. I also got stuck in the first room because I didn't realize there was a double jump since it wasn't included in the initial mechanics list. Overall I think its a great story idea, game play, and levels!