Nice demo! This shows the difference between these platformers very well. Hollow Knight's unaccelerated and relatively slow movement is why I didn't like it that much. The walljump behaviour of Celeste was a bit different than in this demo iirc. Celeste would not jump far away off the wall but short staying near it, if the direction key was not pressed when pressing jump on a wall. The short walljump is not in this Celeste demo, however she couldn't rise by walljumping, that's correct. Also there is a strange air-dash when pressing shift. However, I'm excited you're onto a new game! I liked COSMOS very much and am looking forward to whatever you plan next! Good luck! :-)