From a technical and visual perspective, it's a very good game.
It's tough to balance an MC being likable in games like these, but I think the author did a disservice by making the MC a huge Gary Stu with tons of backstory the players don't see or go through. Showing and not telling isn't just for movies, it's great for visual novels as well BECAUSE of how visual it is, when we get lore dumps about what the MC did before we had control of him, it ruins a lot of the punch and weight of the decisions, and the plot doesn't make up for it.
I enjoy plot in my visual novels, and yes I mean actual plot, even in adult ones, and I know the author put a ton of effort that should be commended, he makes frequent updates compared to a lot of his peers, I think there is a fundamental thing missing from this game for me to embrace it truly. If the MC was NEW to this universe and could explore it along with the players, this game would be better. We don't need some ultra-high vampire prince to take control of, we could have a character that grows more with us.
I know this review might not be completely favorable but I do want the author to know I respect his abilities as both an artist and the effort he has put in, it's just you drop us off the deep end and instead of us as the players learning it as we go along, we get lore dumps from the MC while explaining it to others.