I apparently angered some bot for using the IntroduceYourself tag too many times even though this a a slow 30 day method of introducing oneself. But I'll stop using it for now.
From a career, perspective that's probably either the X-Files game back in the day or the Dragon Wars mobile game from a few years ago.
But from a tabletop perspective I'd probably have to say The Extraordinarily Horrible Children of Raven's Hollow. It started as a little dice game and then it got played by some people in Hungry of all places and their feedback was so pitch perfect that it inspired me to revise the game and play it locally. After that playtest it morphed into a card based game and then only required a few more tweaks to get it into the form it is now.
It's reliably fun. It does what I built it to do. And it's unusual in that it supports up to 10 people. And I usually play it with about 8-10 people because it always fills up at cons.