itch.io

Yep that could work.

If you buy a game you should own it. That means you get updates without paying again. A lot of platforms do not respect that. Patreon pushes ongoing payments just to keep access. Itch used to be fine but then they changed things and screwed a lot of people over. I use Nightfall now. It avoids this whole problem and does not force constant spending like the others do.