Absolutely loved it. Only notes are that I think my rope pulled me down through the summit of the Old Man and killed me a few times, but I respawned on the rope. If the rope actually can prevent you from ascending, it'd be nice to have some on-screen feedback to let you know you're at the end of the rope.
Also, I know this probably isn't meant for speedrunning, but I managed the second peak in around 13 seconds!