Look, im not gonna tell you how to make your game, its your idea and it has to inspire passion so you can continue making it and not feel burned while doing so. I strongly suggest you look for a writer or a good translator to help you out, many games die because they are not well written. If its your first game, you could try making chapters out of it, so in the 1st chapter, you can experiment and try new things, nothing fancy at the beginning, so in the 2nd chapter, you can apply everything you've learned and make a much better game and so on, "keep it simple at start ( using things your familiar with) and then to more complex things later (no need to go crazy neither).
Personally, i would love to see some incest and corruption, but try to imitate what other devs do to keep it patreon friendly (incest patch), ppl love that, me included. Making a dating sim game with lewd levels (clothes and reactions, get lewder in each level). But this is my personal preferences, you can do what ever you want.
I hope i helped you at any level, good luck!
Btw, don't lock your 1st posts for patreons until you got a playable demo with descent content, you gotta show your product before charging for it.