Thank you! I totally get what you're saying about the walljump feeling inconsistent, as it wasn't explained very well. The way it works is it actually just checks if you're close to a wall while in the air and moving at a certain velocity (slightly faster than walk speed). If all of these conditions are met, you can walljump in the direction of the camera.
After watching a few friends play through the game, I've realized most players seem to expect the wallside to be attaching you to the wall and allow a walljump. However, because it doesn't, players try to push themselves into the wall, which then puts their velocity below the walljump threshold.
Adding that high velocity threshold seemed like a good idea when I first added it, but in retrospect the game would probably feel a lot better without it. Oopsie!
Edit: I talked to the organizers and got permission to patch this out as of 11/10 8:48pm PST