Heya! You dropped by stream a few days wanting feedback on the games difficulty - after playing it, honestly I think I can't answer that question! Its entirely up to you to decide where on the Rage to Fun you want the player to experience.
I think for the length to complete, this is pretty good, as its frustrating but the maps small enough that you can't ever make too much progress to feel too bad losing it. If you wanted to extend this level into a full experience, I would find ways to make dynamic checkpoints and ramp up the difficulty of the jumps precision - one way platforms would be the easy option, but there's also geometry options you've used to also achieve the same!