Hold the mouse button to go up. Release to go down. Don't hit the edges of the tunnel. it starts pretty quick so be on your feet.
I found an awesome RPG by chrisbown. I know how hard it is to make these games, so please check his out! http://scratch.mit.edu/projects/chrisbown/3023023 I found an interesting way to create pseudo-3d graphics with the pen, will try it out here. My high score is 2207.
