Just finished playing.
What can I say? "The Deluca family" is slow burn, this is something else. Slow burn is when theres's a story or conversation plan which you follow to achieve something with someone. It's not like that in this game. I don't know what's going on with dev's writing skills, but this game is not slow burn, it's not even heated.
I don't know whether dev is reading this topic or not but that's my honest opinion. It's something like graphomania, dialogs looks this way:
And yes, there are only dialogs and meaningless choices (well, some of them are not, can you guess which?). Renders are wonderful although and it's really feast for my eyes, except it's just a fashion show without any sign of VN.
I can join with people that already said about adressing. I spoke only a couple of times with Americans but every time they introduce themselves with their full name (well, there was few times I "spoke" with Americans via e-mail but that was another matter). And AFAIK adressing by Mr/Ms/Mrs last name is purely official and uses only in official situations (first meeting, serviceman-customer, speaking with officials etc), for obvious reasons people feel uncomfortable when speking this way. For example, when teacher speaks with his pupil's parents, he use Mr/Mrs in school but their first names when in parents' house. 'Cause it's not official meeting, simple as that. But in this game it's politeness, officiality and small talk all the way, nothing else. Even when some characters speak from their heart it doesn't feel this way. Because politeness and officiality, it kills any alive dialog. I sincerely wish dev will start to write actual dialogs, like people speak IRL. Maybe then the game would be interesting to play. Right now it's just a whole lot of boring small talk.