Haha today is polls-day! I forgot about this game, and since was just released on Steam, thought was a good time to do the poll 

I was just thinking that I need somewhere to express how much I love Eloy!
A character that's pursuing someone who says they're not interested could have ended up creepy, but I think the writer pulled it off excellently. Eloy is so cute. And clever, loyal and funny. And a lot less suave than he'd like to think. Seeing a flirty character occasionally being caught unawares and blushing is so much fun.
I very much agree with most of what you have said here and I think a Heirs & Graces 2 would be great. It would be a different game of course, more focused on the Graces than the Heir(s) part, since I assume it would focus on the difficulties our dear Marcel would face as a newly minted nobleman and thus would continue from the "heir" ending.
It also means he's in Eloy's world now. Sad that it, like many dating games, ends when the relationship is just starting and I would definitely like to explore the relationships more. Particularly Eloy's