The Cube

GAME INFO
My first game I ever made. It's kind of bad, but it was a learning experience and better things are hoped for in the future. Any thing that could be helpful to me is greatly appreciated.If you can beat it please tell me because I only beat it once!One more note I realize the shaking of the screen when your not moving and know what's causing it but I'm not sure if I will fix it. I think this may be the final few versions and that's it. I will be working on new things so that may not be fixed. any other issues please address them in the comments.
Use the arrow keys to go forward backward and jump. when you die press R to restart and either click the start button or press space to start the second round.