itch.io

The game updates are monthly paid like in patreon or subsc, they use itch as another way to sell the updates like a suscription i imagine for those who dont want or cant use the other two platforms. I find it a pain in the azz tho cause u gona end up with a library full of outdated versions of the game.

I'd speculate the strat here is to keep making new "Pure Onyx" pages as new editions of the game so you have to keep paying for the game as described by Popol. If they just update the version on a single page you can use use the "I already paid for this game" button. But seeing how the website registers this as a different game/page it doesnt flag it as so.