Download Alien Decimation
Alien Decimation is a game that features a similar concept like Space Invaders but there is a big difference now. The game that you will have the possibility to play now is played using a multiplayer mode, too, and you will be able to play with up to another three friends in order to take care of the aliens.
However, the more of you, the more of them, so you should be prepared for harder battles as you start the game in multiplayer. If you do not want to do this, you can also choose the single player mode and still have fun.