Your ship pivots around a polar coordinate system. Type in the angle (In degrees) that you want to turn and your ship will slowly move in that direction. You can not fire and shoot and the same time, so you must be quick with your angle measurements. Collect gems for upgrades, and don't let your health reach zero. Destroy all the missiles from a level and you will receive a bonus round in which you can collect even more gems to help buy yourself upgrades. Different gem colors have different values as well as different missile colors represent different kinds of them. It is your responsibility to learn what represents what. On a final note, there is hidden content packed into every crease of the game; if you keep your wits about you, you may unlock powerful content like news ships or added weaponry. Enter desired angle with keyboard and hit enter to begin to run.