I am amazed at how much you managed to get in there: jump'n'run mechanics, menu and level select, even a dialog system (kinda).
Two issues I had while playing:
- When falling back down, the camera only goes as far as your feet, but you can't see the platform you're standing on. This is fine on the ground floor, but not if the platform has edges you now can't see.
- The green platforms... they can very easily send you back very far, which sometimes means you have to do the whole level again. I guess this is by design, but it became more discouraging than challenging.