Use up arrow to accelerate the rocket, down to slow it down. Use left and right arrow keys to steer. Use O to show variables, P to hide them. Note: Due to the lack of friction in space, you will continue to slide. For a nice, smooth glide, with good turns, use Speed=0.05, Turn=3.73.
Just a little demo! Everything by me, but thanks to @Miner3141 for the sweet spot coordinates (above).