I played the game on computer in the browser which I love when people make it browser accesible, anyway, I found some slight bugs / I have some feedback.
During the jumping part it was a little hard to time it right, because you have to jump up the stairs. When you do the wall run thing the camera kind of breaks (the two wall part). Then when I was in playground with the grappling hook I thought it was kinda weird it was "e" and was thinking left click would be nicer (but your choice, it's fine). Lastly the toggle of the grappling hook instead of when you hold it was weird (again, your choice, its fine).
Sorry if im being mean I don't mean to, i just trying to tell you what I noticed