I've just finished playing the demo! And I loved it - the story is great, and this is my first time seeing something like that, I think. I love the characters - most of them are very compelling and interesting, and I want to know more about them. Reina is very cool too - she isn't too naive or clumsy or anything, but you didn't try to make a "strong woman" heroine - in the badass sense - wich seems to be a common thing now, and people often overdo it.
Now, I half agree with the first person who commented, they aren't wrong when they say the sprites all have more or less the same face. But I don't think it is as bad as they say. Sure, the faces look the same, but fortunately the expressions aren't. So when characters interract with each others and their expressions change, you see each one personnalities shine through, and it makes them more different from each other. Now, sure I suggest you to be more careful about that if you do another game at some point, but it should work out fine with this one. Besides, I'm an artist myself, so I tend to notice these things, but I think lots of people won't really see that, since the art style itself is quite pretty - more than in lots of otome games out there.
But while the characters look fine in my opinion, I think you should reconsider the backgrounds, if it isn't too late. I've noticed some of the backgrounds are actual drawings, while some are photoshopped photographies. Both are fine, but mixing the two makes it look weird - it would be better to stick with one style. I've also noticed one thing that bothers me a lot about one of the photography ones. The living room one, to be precise - there is an electrical fan and lamp, and overall modern furniture, while the setting of the game clearly doesn't seem modern. It's really disturbing.
I've also noticed a few other minor issues. In the preferences menu, the skip options are labelled in a way that may be confusing for people not used to Ren'Py games. In the "Skip" section, it would be better to write "All text" and "Read text" instead of just "All" and "Read". And the "Skip options" is a really obscure label - it would be clearer if it was labelled something like "Skip after choice" or even "After choice" alone.
And last, the name of the town. "Ville du la Reine" - you wanted it to be called City of the Queen, un French, right? The correct grammar would be "Ville de la Reine" (French is my mother language - this is why my English may be a bit off too, haha).
I hope my critic isn't too harsh, but I believe it's constructive enough? I really like this game overall, and I'll be glad to purchase the full version. I'm so sad I can't afford to spend $400 like that for the ending offer - I would totally do it if I could, it would be so cool! I hope you'll manage to sell the spots anyway!