Well, I haven't exactly ever used this feature, but I think it's important I do use it. After watching gameplay, and a bit of reviews. It appears that that NOBODY knows how to wall-climb. (aka wall jumping)
So, to assist you in your little issue. Here's the tech behind it all!
The way it works, is that if you're touching a wall, and then you move AWAY from the wall. The exact frame you stop touching that wall the game lets you jump again. Isn't that easy to grasp?
And to those saying the game is short in content, or it feels unfinished. Give us a bit. We're working on something big for the game. If you want some updates about it (or you want to complain about stuff) go over to our discord, where we'll gladly listen to your opinion.