At first I was confused by the fact that you called spikes a cube and I'm not sure if I missed it but I didn't find instructions on how to show the real world, I had to figure it out by trying different keys. But that's just an observation, the only real issue for me was that for some reason sometimes the jump didn't work and that was a bit annoying. Other than that, it's a nice idea. Also if you want people to see it as a Speed platformer game you might want to consider increasing the movement speed a little bit to make it feel more dynamic.