This is very impressive. I really liked the mechanic and the leveldesign.
Unfortunately I wasn't able to finish the game, because I got softlocked when I arrived at the red door without the key. I didn't find a way to get back from there without dying...
The controls and the jump puzzles were very hard to learn but, the frequent savepoints helped a lot to not get frustrated :)
The music and the art set the mood of the game in a nice way. And I loved the camera transitions.
Great entry! Well done!