Wait, what's happened with Trials in Tainted Space? I don't remember incest in there, unless you eventually get an oppertunity to "fight" your BBEG of choice (your cousin) but i've never finished the actual main questline of the game, if it's finished at all at this point.
Trials in Tainted Space actually had multiple incestuous scenarios within it. Mating with the Wyvern on Uveto could lead to incest with your spawn, Kiro had sex with her sister on multiple occasions with you, and (spoilers) you also had sex with your sister; Shade; a good few times if you'd played the game the way most people did. There are a few more cases that I'm forgetting I'm sure, but those are just to name a few that Fenoxo had to redesign to avoid being forced to take down his game from several second-hand digital peddlers like GitHub and Itch.io that he relied on to gain publicity and new players.
Oh, that sucks. I generally dont get farther than the planet with the cows or the one that's basically a junkyard. I tend to turtle, and go very slow, either focusing on trying to get myself looking the way I want, or leveling myself as much as I can before I get board and move on finally.
I also didnt think I had a sister, since the BBEG introduced at the start is your Cousin and the intro character design etc etc makes it like you are a single child. I know banging a 1st / 2nd cousin is still incest.