just ply the game it has some bugs with jumping and dashing at the same time and a sugenst you add coyote time as a esey mode and for hard mode maket shorter
I am not sure if the bug you are talking about is regarding the height and sometimes the dash would go diagonally when it shouldn't but I fixed that, all superdash when on air should go as far as the one on the ground and should go straight in your chosen direction.
I really didn't know about Coyote Time previously and you mentioning it really helped me polish this game, thanks. I have implemented it on the game.