My unsolicited feedback: Grand Duke is great but you didn't write enough sex scenes. The game is like 5-6 chapters and has two extremely good scenes, but they're both with the same character... in a harem fantasy. You devote entire chapters to world building and exposition but neglect the genre. This is strange to me because the two scenes you do have are really really good. Like way better than other similar games... but there are only two scenes.
Like, write a couple Seraphina events and maybe a threesome of maids and I think you'd see a very different response. You constructed a harem of one girl lol.
Like Mr Cheese, I hope you return because I enjoyed your game.