Congrats, you delivered a complete game within 3 hours dev time. What I like most is that you managed to squeeze in multiple levels with increasing difficulty, "puzzle logic" and challenge. Also the idea to use gravity in different ways (up, down) on different objects requiring activation is very nice. You even have a menu, and the in-game graphics are appropriate to explain the gameplay sufficiently. For me it's a really complex and feature-rich game for a mere 3 hours. The multi-level feature alone makes it outstanding for me!)

Overall a fun experience, but I have to say that the controls are not very easy to use. I would go for all arrows and mouse or wasd and space!