If you've ever thought to yourself, I wonder what Jusant would be like if David Szymanski made it, you'll be thrilled to hear about White Knuckle, "a first-person roguelite speed-climbing game" being developed by three-person indie studio Dark Machine Games. Even better, you can partake in its unique horrors right now thanks to a free demo on Steam.
At their most basic level, the climbing mechanics in White Knuckle and Jusant are quite similar: Your left and right mouse buttons correspond to your left and right hands, and you click and release to open and close them as you climb ever upward. There's a rhythm to it, and once you're in the flow you can make upward progress pretty quickly.