Defend your base from huge hordes of alien critters. Bombard them with cannons, lasers, and more while upgrading your base so you can survive the onslaught.
Someone caught some unbelievable footage of a grounded UFO. They zoom in later in the video and you can see what appears to be alien beings outside the ship.
Alien Growth On Back of Head
Now that's what you call a costume!
Alien Fish Washed Up On Shore
Hard to imagine what the final product looks like when compared to the thumbnail for this video.