By any chance, was this inspired by the DS game Hotel Dusk: Room 215? Because the style/tone of it really reminds me of Hotel Dusk, in a very good way.
Not to mention the parallels between Kyle and Bradley from Hotel Dusk vs Crawford and his former partner, along with the backstory of what they were up to before going missing (Investigating some sort of illicit organisation and then allegedly switching sides and betraying the police).
All in all, this is honestly excellent. Only played it once and got 3 stars so far, but I'm planning to get to the bottom of this even if it takes all year :P