The Mixolumia postmortem is really interesting: https://mixolumia.com/postmortem/
I can think of three people I know who own this game off the top of my head and I saw when it was getting some press coverage, and I'm definitely guilty of extrapolating from those to "massive success." I should know better!
But also: y'all should try Mixolumia, it's good
The social network of the future: No ads, no corporate surveillance, ethical design, and decentralization! Own your data with Mastodon!