This game has some of the best graphics and music I have seen in the entire jam. You are really, really talented! The power jump mechanic took me a bit of time to understand (basically you can only use it if you have *not* jumped to grapple) but after that it was really a fun challenge to go through this game. I loved the colors / animations / particle effect, everything felt so polished!
The overall gameplay was very challenging, and of course came with its own frustation similar to "Getting Over It". Part of this I think could be improved a bit by providing more leniency towards edges. I found myself punished way too many times for approaching an edge too fast, or getting to close, and I felt like I was falling through the ground. (see GIF below)
Compare that with Mario (which is already known for being quite difficult) who is perfectly stable here:
This I think would allow for a more predictable gameplay without compromising on the fun aspect. Anyways, something to try out :)