Game Description: Life Force is a horizontal and vertical scrolling shoot-'em-up set inside a human body, where players control a spaceship tasked with defeating alien invaders. The game features cooperative two-player action, where players can upgrade their weapons and abilities by collecting power-ups. The player fights through a series of organic-themed stages, with enemies resembling viruses, bacteria, and other pathogens. The goal is to defeat the alien forces within the body and restore health by completing each level.