There's a bug that prevents jumping. It's happening because, even though you've set it to only change the frame rate if it's not equal to 12, when you walk it changes the frame rate, causing it to freeze at 11. I think that's it.
This game is really cool, I think a charging bar to determine the jump height would be good, and I also think it would be a little better to prevent movement while charging the jump.
Have you been looking for a very satisfying game similar to fist fighter by ratyu? Then you are in luck! For Temu_Null has provided a new game like that! Updates shall come every week or some day. Play now in my profile!