This game was very fun! I really like the screen wrapping mechanic and i would have loved to see more of it in the later sections, as it largely wasn't used after the first few levels unfortunately. Great level design as a whole, I really enjoyed this! As some other people have said, though, if you throw a box (or presumably the key as well) while close to the ceiling it will get stuck there, and if it gets stuck far enough in you cannot pick it up again.