Cool (heh) game! The assets were beautiful, I liked how many different environmental elements you make, it helped sell the idea a lot more!
It's sometimes hard to tell what can hurt you, but with constant checkpoints that's not too big of an issue.
I feel like the grappling hook should be reflavored, since you're not really affected by gravity as I would expect. I also wish that the wall jumping was a little higher and that you could drop down when grappling and not be forced to make a huge jump. These are minor nitpicks though, overall I like the game!