Defend the Earth - Bosses and Lasers Update

*New Update* You survived once against regular alien ships, but can you beat the boss? New boss ship added to the game that spawns around the 7 minute mark. If it reaches the Earth, it will deal maximum damage and the game will be over! To aid you in your fight, you can now purchase a defensive laser that fires from the Earths surface. This laser, available once you reach level 10, will automatically shoot at the nearest ship to the Earth. Due to changes made in this update, highscores from prev...