This reminds me of the same thing that happened with Stardew Valley, the creator missed the old Harvest Moon games, didn't find a suitable substitute, and just build the entirety of the game from scratch, teaching himself art and music composition too. He's made over $300 million in revenue so far and might be the first solo game dev (or even regular software dev) to hit $1 billion in the course of the game's existence.
It just goes to show that the dominant players are not always dominant forever, and that common YC startup advice of understanding what exactly users want (hint: they don't want always-online DRM-filled games that nickle and dime you with microtransactions (well, most people anyway, there are always gacha/gambling-type whale gamers)) and serving them well is still correct.