TEARS Windows, Mac, Linux game

TEARS is a science fiction first person shooter in which you (Jasper Kohl) and a ship full of marines are sent out to space in order to overlook the terraforming of Venus, to make sure nothing goes wrong. However, the terraforming process is interrupted by a portal opening on the face of Venus, and an alien spacecraft emerging from it. The spacecraft locks on to your ship, and several follow it, travelling towards Earth. You, and two other soldiers who avoided the alien attack and capture of your ship, must stop the invasion before all hell breaks loose, and Earth is nothing but a memory.