Nice game! Definitely what this jam was meant to have, with good focus on the core mechanic and the platforming puzzles that it can solve. It took time to understand how the controls work exactly, and the player character is able to rotate for no real good reason, and there are a few small bugs, but overall it's satisfying to figure out how this mechanic works and play with it.
I wish that the white yo-yo rope line was consistent - I think it's better to have the cursor "wrong" than the line to the yo-yo "wrong". Also, I think the player character could be a bit smaller (or the world a bit more zoomed out).
Is the yo-yo movement-towards-cursor speed limit on purpose? I didn't like how I had to act fast and move the cursor quickly so that the yo-yo could catch up in time, but maybe it was meant as an additional skill challenge for the game.