I think the jump needs some "coyote time"(aka ability to jump during some short time just after the player left the floor), it really felt to me all the time that I pressed the jump when I was still on the floor, but jump didn't occur. Apart from that, the game felt pretty fun to me, nice mechanic, also great music track, just the right style to fit the game, wasn't tired of it after dozens of tries, and really cool track in general!