Not sure about Patreon's terms for incest (California has silly laws and even if characters aren't blood-related, you can expect something like "you're trying to lure people into incestual relationships anyway") but that would be a fun and unexpected addition especially considering the protagonist's background.
I really like the way you've been building the lore around your game, much better than doing it on-the-fly as you expand it. Gives some kind of choose your own adventure book feel to it too! (Maybe it's just me being a hopeless nostalgic heh. I'll go with "a small, isolated village" because I am a lone wolf and I am so gonna get raped.
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)
Don't sweat the planned features though, if people go crazy on the demo and are disappointed with the release because the demo actually had tons of planned content that attracted them and they expected even more, that'd really suck for a project with potential. Make sure you take your time, do it slowly and enjoy life while you can, we mortals (ha) only have so little to spare.
Doing it slowly also ensures you can do it regularly without your life taking too much of a hit. If you're going with Patreon or any other monthly "subscription" platform for the full development period, that's probably the better kind of option. You can also make people pay per post if you feel more confident with that approach, I've never tried it but the way it's described, feels less of a moral binding. If patrons don't mind either way then don't overthink that part.
As usual best of luck with the project. The screenshots are promising!