The art looks pretty neat. As mentioned in other comments some sort of checkpoints would be neat since there are a few challenging parts around the level. It would definitely help to have some sort of in game guide for the double jump and wall climb though I did figure it out after a bit.
On the side note, the jumping and wall jumping feels a bit off but I cannot place a handle on how it feels a bit wonky but probably a good idea to check for game feel there.