Space Invaders : Alien Swarm

Earth’s very existence is threatened. Alien invaders from space have been sent to destroy our planet. You have been called up to repel their attack. You must plan your battle strategy well and upgrade your fighter ship to defeat the increasingly advanced aliens. To accomplish this task, you must have the courage and wisdom.

Simple game rule but it's surprisingly challenging.
The Galaxy's future is now in your hands. Play now, you can do it!