I've been disappointed by so many VN's, but I have to say this one was truly surprising! The story is is actually unique and coherent, the dialog is clear and flows well for the most part, the character's are real and human looking, and it's finally an adult game that isn't afraid to feature seriously adult, dark themes IF you so choose to follow that path, but offers the Role Playing options to be good if you prefer. These are all really impressive feats in this field.
If I could offer my humble suggestions for your next game, I would say:
***SPOILERS***
The incest angle is a kink for some, but not for me and I suspect not for many others. Maybe I missed it somewhere, but I never once read that she was my step daughter until well after having arrived in the city, and that one time was so out of the blue that I don't know to believe it or if it was a typo. I know inserting the girl is part of the twisted game your boss is playing with us, but based on what I've played so far (the free content available her eon itch) it feels like it hasn't added to the story and should have been more avoidable. Plus having a family and a 'loving daughter' affects the otherwise well done roleplay options in the game. If I want to play an evil bastard from the beginning, the devoted child and regretful ex wife are out of place. Cutting the detailed backstory and waking up on the island would have cut to the chase; any needed backstory and plot could be filled in as the story unfolded, perhaps with player driven choices the way Seeds of Chaos does.
Lean more into the badass / dominant male fantasy and realism. You offer some of this and tease it a lot, but more often then not we actually end up at the mercy of the NPCs. Multiple times we're shown a serious, competent, deadly player, and then in the next scene I'm being held at gunpoint. The most unrealistic scene imo was running into the raider queen chick who demanded sexual favors in exchange for supplies. Really? She had armed dudes at her beck and call, who are for some reason loyal to her, and she effectively SA's the player?
Other than that, I'm really enjoying the game! Got my fingers crossed after you've wrapped this up you'll make something similar in a new setting! A Conan / Viking type warrior in a dark fantasy world going on bloody and sexy adventures!