Bro, they're monster girls. There are no trans or futa options. The closest thing would be amalgams, but that's highly doubtful. I don't think there's a futanari or trans option. You'll have to wait until you complete the game and do the pacifist route to enter the royal lab.
Don't worry, this guy has just been copy-pasting his message for years. He doesn't bother to say so when it's a game with only heterosexual content. A little research and he'd know it's inspired by the webcomic.
I've seen it in several games I follow, and he even says it when the creator says there won't be any gay/futa content.
I never say anything, but I'm starting to get fed up.