First impression; honestly thought the title was some kinda malaproprism/wordplay of bad manners so maybe it had to do with it or the way mc got stood up by her friend (who I suspected was a jerk at the start from how the mc acted dismissive and all). Also neato textbar, UI and all that stuffs feeling the rich neon retro-ness through that captured slight dreamcore with how the backgrounds/settings portrayed.
Diving into the game, my first thought when I met him already giving off bright suspicious flags going on but he was kinda cute and I still didn't have the heart to act rude or mean to him anyway. The realization when he had that phone and the implication though, a good caught-me-off-guard moment and his comments on the cage (this threw me back to that Toma Amnesia moment lol), plus the painting? Before finally that reveal in the vent (my brain lagged for a second in disbelief and bewilderment from his accusation about mc suspecting something's absolutely up with this guy). The built up tension, mystery and fun little puzzles (I spent half an hour on cracking the passcode because my brain did a dummy 💔 I enjoyed the funerals one the most) up to that point and from there on really hooked me in and kept me at the edge of my seat, you nailed the thriller tag 💯 I think he exhibited some psychopathic behaviors (not rlly sure) he might have been one and this could need an added warning for that, but I would like to say towards his one dialogue telling mc a loser for all this time or along those lines; he was the silly foolish one to get ahead of himself and thinking he could get away freely with what he gained >:) certainly an interesting (type I tried hard to not fell in love with and luckily succeeded) guy though
All in all, I enjoyed this game, looking forward to your future works!