Yeah... The jump curves were a huge problem for us, and we wanted to make it more accurate, but couldn't figure it out in time. I think if we had figured it out, it'll probably be a decent improvement to how the player controls and feels.
As for the difficulty, we have to thank our playtesters for that. Through somewhat rigorous playtesting from multiple people, we slowly tweaked the levels until they were easy/challenging enough, but I personally still think that the final level is still perhaps a little too difficult.
Thanks a lot for playing!