For a game built on Scratch, I've gotta say that it was impressive what you were able to do! I share the sentiments with the others about the controls being spammable (I got to 2020 before calling it quits), but I can see what you were going for with those QWOP inspirations.
I think you have something solid to build on, if you choose to continue working on it later. But you definitely got the climbing aspect of the game jam's theme down, good work ^^