Thanks for the feedback. In hindsight I wouldn't have used the word "climb" in the controls, as all I mean by climb is right clicking to go up the chain. You only ever need to actually climb a wall, by repeatedly spearing it at the end of the game. You are supposed to jump as far up as possible and use right click to pull yourself over. I used unity's physics engine (hinge joints in the chain) and a distance limiter to the spear to prevent the chains from coming apart at high speeds. The chain physics messed with the player a little though, which causes the sinking and occasional jump to fail.