Love the mechanic. Feels super unique and like it has tons of potential to work into something bigger.
I personally found it preposterously difficult, but I am terrible at platformers anyway, and I also think these controls probably would be a bit difficult to master and part of the appeal is that you want to figure them out.
I agree that the gravity slider is mislabeled and I was initially confused by it. I also wonder if some of the difficulty weirdness couldn't be helped by maybe controlling the sliders in a different way (like something keyboard or even on a controller)? Or maybe giving them set intervals that they snap to? I don't know, just some thoughts I had, not trying to hijack your game or anything, haha.
Overall, this is simple, but functions really well as a sort of proof of concept I think. Shows off these unique controls and lets folks sort of test the waters. Perfect game jam stuff essentially. Nice work!