The story is great, the art is great and I think the majority of people looking for queer fantasy visual novels will ignore this guy's comment. I think they're just transphobic ("Please be respectful of the fact that some gay men are fully homosexual and can be turned-off or otherwise bothered by female anatomy" and the hyperfocus on their pronoun confusion for Sidd) and want to whinge that diversity exists.
I wouldn't go as far as calling people transphobic. Folks are allowed to have preferences.
I'm more bothered by the fact that someone made up an entire alternate universe in their head and then posted 6 paragraphs onto the front page of an FVN to warn people about it . If he was wondering if these topics would pop up in the story, he could've just asked lol