I used to use Mandrake back in the day. Those Mandrake descendants, as long as they're actively being maintained, could be interesting.
The issue isn't if something is a fork or not, the issue is if something is a fork of a corporate distro. For instance, there are forks of Arch that still meet the criteria because Arch is a base community distro, whereas OpenSuse is a fork of a corporate distro.
The problem with OpenSuse is it's based on a corporate product, not an original community base.
But how many of those meet the criteria of not being based on corporate distros and are also user friendly? For instance, I wouldn't exactly classify Gentoo as user friendly.
No, the game I'm thinking of isn't an action game, it's an adventure game similar to Myst where you navigate by moving from room to room.
I don't mind adding forks to the list, or distros based on other distros, as long as the distro they're based on is a community distro and not a corporate distro. Like you point out though, there aren't a lot of those.