My first game written from scratch was a Reversi program written in BASIC on an Apple II. I found out it was published in a pirated way when someone gave me floppy disk full of games and mine was on it! I was hoping it would show up on some Apple II internet archive but haven't seen it.
But my first real game industry game was working on HyperBowl for a studio back in 2001, and now I have my own remade licensed version on itch.io!