The fate of the galaxy is in your hands. Can you save Earth once again? Crusaders of Space 2 takes the classic gameplay of Space Invaders and adds a number of modern innovations. One improvement is the ability to fire missiles at enemies. As you shoot down invaders, aliens sometimes drop missiles you can collect. An enemy might also release one of three weapon boosts. The Freeze boost, for example, stops an invader in its tracks and shuts down its weapons.