The mechanics are quite unique but it’s also a bit unintuitive as the others have said. Maybe it’s just my own skill issue though.
It was probably by design, but I found the speed difficult to use in conjunction with the jump. For example, you need to time the jump right, however the speed made you go a bit fast and it’s difficult to anticipate when to press jump. When you put too little speed though (because I want to go slower to time the jump), the player may run out of juice too soon.
I suggest maybe a way to change the intensity of the variables before you use them, perhaps with sliders next to them. For example, choosing to go at a slower speed would cost less speed juice, choosing to jump shorter would also do the same. Something like that. That’s just my thoughts though.
I think that the design of a puzzle based around allocating resources to your abilities is really interesting. Good job with the game!