In terms of renders and lines, kaira by far out-dwarves the patreon commissioned characters. This is a fact. I enjoy involving patrons in my game, and in my book i say that the game is mine as much as it is theirs. I think it's fine to be on principle opposed to any content that is not originally a vision of the developer, but I think the game is still in the right place, and my evidence for that would be the main characters still all having the most renders, lines and effort dedicated to them.Those measures do not seem to have covered Kaira lol (seriously one of Key characters of importance storywise to MC having three scenes and two of them in prologue) the content varies so much between each girl already its clear your measures are failing. In a sandbox game you need to keep your timelines concurrent which means you need to balance the content. You have a sponsors non storyline character with more content than most your storyline characters....you have a barmaid that supposedly broke off relationship because going away still working in bar two weeks later. You can't have a few days go by for one character while weeks go by for another and expect story to hold together. This i why when telling a story regardless if novel, game or movie you need a timeline tree covering every characters arc. Its so much harder with a game which just makes it more important to have it planned out and allow for variations as arcs intertwine at different points. You have a Nicole and Kaira intersection coming up, are you planning on having that while Nicole already deep in relationship yet his own sister has only seen him once in that same time?
I like your concept and your storytelling but you need to take more control now before the timeline disparities and side content unravel the story you trying to tell. I know journey is important but you still need to have destination in sight and plan on how you getting there with every single character.