I will try the game at home just to be sure. Maybe you could check the framerate of your machine, because the controls a tight linked to the framerate, at the 120hz it's pretty hard to jump in time.
There is still a whole lot of room for improvement, mostly adding some juicy to the game, but for now, the game is "done", I did learn what I needed to learn, and now it's time to move to a different game.
That's a small experiment for this kind of gameplay and toying around with the engine and the new language that I'm learning. I'll take a new look at this kind of gameplay in the future for sure! :D