Oh wow, this is great, way more fun than I thought it would be. Once you get the hang of it, the game feel is great and it's very satisfying. There's also a surprising amount of variety within this; more than you'd think for this kind of game. Great tutorials, great physics. It is very frustrating, but in a QWOP or Surgeon Simulator way where it's fun. It also has great speedrun potential because of the way the physics work, and it seems also you can make the rope shorter than intended in certain ways to go even faster.
Didn't complete it though; 15 minutes in I had to do a series of momemtum jumps in a row, and I got through most of them before falling down (it feels like missing a Bowser throw in SM64). I failed this again and fell throuh the four rings section and decided that I wasn't doing that again.
Great game though, fun, frustating, awesome game feel.