Use the up arrow to move up. Use the left and right arrow keys to move left and right. It shows your altitude in the top left hand corner. I just made it out of 10 for simplicity.
Took a little while, just to get things to work. It was fun though! In the future, I might add control over the x position. It ins't 100% Pen, as I use a brightness effect on the background so it looks like you are actually moving (kinda). I know the propeller animation looks really bad, but it turned out better than I expected and I'm happy with it.
