Arrow keys. Try jumping into the wall without pressing up arrow. Features - Momentum - Wall jumping - Some animation (WIP) - Wall Grab - Wall Slipping (You have to keep holding down the left/right arrow key for this to work)
Thanks to @griffpatch_tutor for teaching me not only how to write most of the code for this in his "Platformer Tutorial v0.12", but teaching me how to think about how to make the character do different things like this.