Originally released in 1990 (and ported to the Sega Genesis in 1992), Corporation was one of the earliest first person shooters. Unlike most later games in the genre (which Wolfenstein 3-D popularized two years later), you didn't aim at the center of the screen, but with your mouse cursor which you could move freely across the screen (while controlling the character's movement with a joystick). System Shock would use a similar targeting model in 1994.
Apart from the shooting, the game has some rudimentary RPG mechanics, including character stats (you get to choose between four characters at the beginning of the game, with varying base stats) which can be enhanced with cybernetic implants, as well as an weight based inventory system. At the beginning of the game, and at various points over the campaign, you get a budget to buy your equipment, which you assign to inventory slots on the character's body.