Alien Shooter
Alien Shooter is a top-down shooter video game by Sigma Team from 2003. It is the first title of the Alien Shooter series, followed by Alien Shooter: Vengeance. There are two expansions for Alien Shooter, Fight for Life and The Experiment. They each contain five new levels, including the conclusion of the Alien Shooter story.
Story
The player takes on the role of a marine who is tasked with cleaning up an experimental laboratory where teleportation devices have allowed legions of aliens to stream into the world. The player is given explosives to open the sealed doors to these top-secret areas; security has been put in place so that stationary miniguns are available to take them out. The government has access to the most advanced weapons available in hopes of eliminating the problem after there were too many casualties in the military's last attack. A heavy burden is placed on one man.