Honestly, I don't think you should pay attention to the opinions of players like me )). I've been gaming for over 30 years, the last 15 of which mostly involve visual novels. I also read a lot of books. Many themes have become boring to me. Besides, in my experience, developers often regret my nitpicking... But since you asked for it, I'd like to see a combination of a clearly engaging plot (perhaps not too radical) with clear plot lines leading to different endings. It's especially interesting when the endings aren't considered trivially good or bad (thereby condemning the player's choice), but are simply a consequence of that choice. For example, even if we sell the vampire to the hunters. Although, to answer your last question, Ace is my first favorite (perhaps his name needs some additional thought—it suggests different things and has nothing to do with his age). But that's simply because I don't like rude people and have a soft spot for blondes.
As for the theme of your game, a couple of years ago I actively played games like Bound by Night (although of course, in its extreme nature, it's hardly comparable to a soft romantic game), and about 15 years ago I read the Anita Blake series, so the company of vampires and werewolves simply doesn't appeal to me as much anymore. But the mood has returned, and I can give it a try. And that's exactly what happened.
In the end, I think you have some fresh ideas of your own, and I'll be eagerly awaiting the results.
