I really liked the UI of this game, is so clean! The backgrounds are so pretty too. My only problem gameplay-wise; would be how sometimes you have to make 100% perfect choices in order to get the happy ending. (edit: Spoilers below)
Character wise, I love them all. But I didn't felt comfortable with the romance in Sachiro's (I found the 1st half to be quite weak) and Junoru's (a lot more heavy-backstory focused) paths.
Zeikun's made me emotional - but at the same time, I found his route to be the most forgettable of them all.
Kurato's is my favorite due to his motivations, personality traits and how he actually interacts with the side cast (and not only the MC). He's a believable and 3D character - through I'm not fan of how his route had a lot of teasing with almost all the other male side characters. I think there was a missing chance of exploring more his beliefs towards justice or work (Sherlock Holmes and Watson style!).
But I know that writing non-human characters, such as demons, gods, angels, 'ghouls' can be hard. Aside that, I overall liked how you connected the plot points, this VN is really good and binge-worthy.