Well well, this is a hidden gem for sure. So much potential, so much delivered. I will say this has the potential to become a full-fledged visual novel but in the transition zone between an adult visual novel and a full-fledged visual novel, just like "Neverwhere." But let me clarify, I am in no way criticizing it; I am satisfied with the length, the story, the characters. But I see much potential here, so I will not just say something vague and waste this chance to give it constructive criticism.
Let's start:
**Pros:**
1. Everything, I mean literally, as a whole package, it is now one of the topmost AVNs developed.
2. The realistic character interactions - no nonsense incest all the time. I don't dislike it as a fetish, but it doesn't happen in real life, and that made your story grow, immersing us into it.
3. The beautiful renders of the characters, especially the female cast; the varieties and possibilities are quite large. While I don't necessarily prioritize renders over the story, it's not a downside. In this case, it added in favor of the story.
4. This may be my most important point: the world-building, this story, while quite coherent. I feel like these are like big chunks of ideas stitched together, and they somehow work in a continuous fashion, making it a beautiful and engaging story. What I mean to say is, this is not a continuous thing. If I can give an analogy to make my point more sense, your story is like a mosaic art vs. most other stories are like a melody. I know it may not make a lot of sense to others, but it does to me because I have tried to create some stories as I have ideas, but they are chunks like this. The thing I am missing is how to form them coherently together. You did, and it works like magic!
5. The consequences of the choices - full points to you!
6. The story took some time to engross me fully, though I won't lie. But when it did, it sucked me into it like a "succubus."
**Cons:**
1. The music, while I liked it, is missing in some places. Please look into it to not break immersion.
2. You can create more drama in certain situations, like the disagreements of the nobles while discussing. Also, where the truth comes to the MC, I think he handles it pretty well. I'm not complaining because I would have chosen to be calm and composed all the time, but we don't know how the protagonist is before we started to play him. Though we get to know him a bit before the reveal, we still haven't seen him get tested much in a tense situation, and so we must consider more human-like emotion from him. Again, it may be the will of the author to be that way.
3. One of the major factors for me, which separates a good AVN I have seen with all-time best, is this: most have a good cast of males. Again, it may be from the part of the author for it to be that way. But I would urge the author to seriously consider this. The story is quite good, but it still feels like an adult game, which it is not trying to limit itself towards. So, a good and large cast of males will be one major step to alleviate that.
4. I think you can add more relationships in the world. The MC doesn't have to be the only active male. I am not saying to fetishize this, the so-called NTR - I hate it. So please don't think I am asking for it. What I am asking for is realistic life, since this has avoided so many tropes used in most adult visual novels, it looks fresh, and at this moment, it is realistic enough. Why not go full at it? Yes, many may feel, "Wait, that girl is so beautiful yet taken." Well, that's life for you because you also avoided the most generic trope or a trap really to break immersion from the story - the harem.
Cons are not criticisms, just my personal suggestions, so take them lightly, dev. You did a wonderful job! Eager for the next update and seeing what's up in the next chapter. Best of luck.