I mean identity is complex, again the game did not need to add the ability of mix matching the voices with the bodies and the pronouns, but it did. I doubt it was hard, but they went out of their way to do that. Most porn games don't let you play anything more than a low opacity faceless brown/black (or godforbid blonde) haired white guy with a horse cock. Anyway I've said all I need to say on this but I'll repeat myself in hopes of clarity: It's not really reasonable to ask the developers for transitioning in this game cause that would take a lot of writing and editing and totally divert a story that ultimately looks like it will either be short or not have time for that, honestly if you were to do it right it would have to be the focus of the game.
I want to be a little optimistic about human beings (atleast on itch) and say they simply just didn't like the idea. And no one said anything about you saying slurs or said transphobic slurs to you (not that that is the only way to be transphobic) you gave a suggestion and then people rated that suggestion (they did not like it)
Though if you'd like to suggest genuinely good trans representation: mixing the genitals with the bodies is something a lot of games have done and worked really well. "What's the point?" well like you said a small minority would like that so we give them that, and then nonbinary people (which exist) can enjoy their pronouns and custom bodies and everyone else can still enjoy the gender of our choice. It's not like they explicitly say you're playing the cis option because gender is not important to the story and because it isn't the cis option it's the female option cis or not. I hope I didn't miss your point and go off on a tangent you weren't even upset about and hopefully I cleared shit up. Also it sounds kind of like you're implying this is shallow representation which like yeah it is, because it's the best they can do with a game that has no story revolving being trans-- anyway kindness or some shit byee.