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 Earth's surface. This laser, available once you reach level 10, will automatic…