Not my first game, but it was the first game I ever saw on PC. In the late 70s, my friend down the street's dad was a professor at the university and had a TRS80 at his house. Phone cradle modem, reel to reel and cassette tape. Paul (friend) was so excited to show off Star Trek to us! Not exactly the most blood-boiling game, and certainly not to an 8-year-old.
My first game was Microsoft Flight Simulator in 1984 on an Apple IIe. No joystick, and 16 fps [if that] on a green monochrome monitor. Once I moved to IBM, the jig was up for Apple! Then it was Chuck Yeager's Advanced Flight Trainer, Lucas Arts Battle of Britain, SWOTL and MicroProse titles...anything I could get. I still have the 5.25" and 3.5" disks for many of the games. They would likely crumble to dust if I tried to insert them though. Fond memories of being a loner without a guitar.