Infinite UFOs

How long can you survive the alien invasion? An old school retro shooter harkening back to the dawn of gaming, but with a modern touch. Compete with your friends for the highest score with online leaderboards, or try to get every achievement. A finely tuned game that even as it gets harder, it is never unfair. If you never make any mistakes, you can play forever. It also includes a soundtrack that is synchronized with the in game night / day cycles.