Verry good speedrun platformer, but like everybody else, I didn't understand how to wall jump before going in the comment section here.
I have to wonder if the fact that you have to point in the opposite direction and press jump at the same time was done on purpose. Normally, you just need to press jump if you are close to the wall on most platformer to do a wall jump.
Anyway, once I got the hang of it, it became fun and I can understand the appeal of a wall jump implemented this way. I would only add the information about the input inside the game (like a hint at the bottom of the screen or a tutorial window at the beginning).
Anyway, 5 star for fun nonetheless :)