I just blew through my first playthrough of this in a couple of hours and I just wanted to say, I had a ton of fun! The sections from the novel meshed very well with the additions; it never felt obviously, jarringly different.
I absolutely ADORE your Eleanor, especially the fact that she's plus-sized. It made me feel very good about myself seeing a fellow bigger woman as a love interest in a game, especially since her plot isn't based around that; it's just a small part of her. I plan on doing the other route and the gender-swap variations of both, but she was simply too lovely to not marry immediately. I think you struck a lovely balance between more period-accurate systemic oppression societal roles and more modern gender, race, sexuality, and body-type diversity.
The art style is also very cute; I agree with your notes in the unstable build that they could use a bit of polish, but I implore you not to change Eleanor and Edmund too much! I was, admittedly, rather disappointed that there was so much gender-customization of the main character but no ability to change their appearance or name -- I personally wanted to be a feminine-looking woman in a masculine style of dress, but you're locked into a very thin and androgynous-looking figure regardless of the biological sex you pick at the beginning of the game. Even so, it is a breath of fresh air to see a deviation from the anime styles that so often overpopulate the visual novel genre. Your backgrounds are also very pretty! So many VNs just have photos that have been put through a bunch of Photoshop effects as the background, but the paintings really tie together the scenes and the mood of the story.
The only real constructive criticism I have is that I think the game could be more engaging with more and more-polished sprites -- variations in poses, more emotional facial expressions, sprites facing different directions, et cetera -- and music/ambient sound. It was already very enjoyable and engaging as a story, but I think that some more motion and dynamism in the audiovisual areas of the game could make it even more so!
Overall, I think you did fantastically both in making a game and adapting a previous work of art. Thank you so much for sharing; I'll be keeping up with the unstable build in hopes that you continue working on the game in the future!