I haven't added a commercial game before, but I will reach out to the owners of the game and see what I can do.

I have not played Unlur. Looks like a cool hex variant. I like the initial phase where who plays white is decided. It is a neat way of working that out.

[0]: https://en.wikipedia.org/wiki/Tafl_games

Possibly, but my takeaway from COVID is that games like chess and go (which experienced a bump in popularity during the lockdowns, and have since been dwindling back down) are not merely gems waiting to be rediscovered, but instead appeal to outdated tastes in gaming, and are unlikely to be replicated given market realities. You need approachability for game-one beginners, you need vivid and eye-catching visuals, you need progression systems and content drips to keep players hooked, you need monetization to milk the whales, etc.

Dominion is also great, and in its simplicity literally invented the deck building genre. But it, too, is too artificially complex to become immortal, even before you get into its 16+ expansions. The proliferation of the deck builder genre also makes it less likely any individual game is going to be deeply studied.

Credit to games like YINSH, anyway, that specifically try to appeal to competitive, deep, and mathematically simple foundations. They just don't have what it takes to thrive in the age of monetized bright flashing lights.