Sorry for double posting, I went ahead and re-read the post and the update again and thought I'd weigh in.
I do not claim to be an expert so take my words with a grain of salt if you will, If you intend to stick around you might as well get used to people in here shoving their opinions down your throat and telling you they are objective facts

I will also repeat on stuff that you probably mostly thought about or planned out already.
In general I think focusing on a few characters in the beginning is a great choice, rather than adding more and more characters that will have limited content, I do think that in the beginning those characters should eventually form a sexual "baseline" for the MC once the first segment or chapter of game/VN is done.
What I meant by that is that they should prepare the MC to explore other and more "hardcore" content for the lack of a better word, with other characters or in continuation for their story lines.
Just as an example by the end of the first chapter(or whatever you call it) the MC should be fairly submissive to women/futas and be able to take a dick/strapon, basically covering more "mundane" stuff, the aim is to appeal to most of the Femdom/Futadom crowd who may not like certain stuff and will chew your ear out about it(and to get more patrons in general).
Only once that it's done you should move on to other stuff like rougher sex, chastity, feminization, exhibitionism etc' in addition to adding more characters or plotlines for the "original cast" that will explore those fetishes.(and again this is my opinion)
Now in regards to choices like clothing I think it shouldn't be much of a priority in the beginning as it will add some burden on you to make certain scenes twice or more times, same goes for location, which in the future could be used in the future to explore exhibitionistic fetishes or feminization for clothing.
Color coded choices is a great idea, the white option could be used to give the player certain optional information like worldbuilding or getting to know small details about characters and also let them know they can skip ahead if they wish using the yellow choice.
On a subjective note I would like to eventually replay the same scene with a different pink option depending, whether it's by gallery or talking to the character at a later date and asking them to repeat the scene.
Tracking player choices for some flavor text would be nice but make sure not to overdo it since you'll probably have a lot of flavor text to write eventually
And again on subjective note, I would like the MC to have the option of being able to get with other Partners without it being cheating on the main love interest(s?), but you'll have to find a decent story solution for it(and not a really good one cause this is a porn game after all

).
Any users who read this feel free to tell me if you disagree on something or might have a better idea, hopefully the Dev could use some of the input for further development
Looking forward for updates!