The longer you hold "Jump" the higher you go. You quickly tap the jump button.
I get the same problem :( The jump is to high. Have tried for about 30 min but I always die at that exact spot where I am supposed to jump to the exit. I either fall down or jump up into the black bar. It might have to do with key stickyness, my keyboard is pretty old so it might be a millisecond to slow making the jump impossible.