IDK, that's like saying that a game that's exclusively male and female sex should only have one type of interaction. You know: fellatio, cunnilingus, missionary, doggy-style, cowgirl. Over and over and over again.
It's clear that you take offense, no matter how hard you try to deny it. That's fine--if it were my game, I wouldn't much like me either. I'm fine with futa on femboy action, or I wouldn't have downloaded your game in the first place. You're putting proverbial words in my mouth by implying somehow that the subject matter is the problem. With more variety, it would be more interesting to me. Personally. That's all I'm saying. I'm sure that your game will do just fine no matter what I think, so why make such a big deal about it?
I'm at least heartened to hear that you're working on the UI, though. Kudos.