What a technically impressive game!
I like the climbing mechanic, though it felt a bit like moving through molasses with how slow the limbs followed the cursor. Might be a performance issue on my end. It also took me a humorous amount of time to figure out that the fifth point of contact isn't the climber biting the rungs of the ladder, but a safety harness.
Fullscreen being broken also made me click outside the game window a few too many times, but ultimately, really good idea, decently executed, and I could definitely see myself playing through a longer version with some of the kinks ironed out.