Very creative interesting idea! I think there's a lot of potential here. I was just a bit confused on what the climbers will do. My suggestion if you expand on this (sorry if you had this and I didn't see it) is to signify what the climber enemies will do, similar to StS, and also somehow visually include how they react to different hazards. It will magnify the puzzle aspect of the game and make the purpose of each player action clearer.