Prototype 3

When [frightening, space-born disks] attack Earth, humanity calls on you to take to the stars and do battle with the [seemingly infinite elliptical armada] using the third most powerful spaceship in the universe.

Use [WASD] or the [arrow keys] to move your ship.

Hold down the [space bar] to fire your weapons.

Pick up the [little cubes] to outfit your ship with more guns and recharge your shields.

Based on the excellent tutorial found within Introduction to Game Design, Prototyping, and Development by Jeremy Gibson Bond. If you're interested in making games, I would highly recommend it. http://book.prototools.net/