Very nice design with a wide variety of (somewhat straightforward) challenges. The music was fantastic, especially on the puzzle level. I'd listen to a lot of it even without the game. Some other sound effects would have been nice, though. The controls felt good, although the jump cooldown felt a bit too long during the parkour level.
Overall, I enjoyed the game!
(Also, if the player is a skeleton as well, why not use the same model for the player?)