They really found a genuinely new idea for a game, although it shares similarities to the even more interesting "The Invisible Hours". You basically play as the fly on the wall, listening in to simultaneously happening conversations, trying to figure out what happened, who did what, etc.
The cases are rather interesting, but there's only five of them (plus a free DLC with one large case and a little addendum for said case). It's a rather short experience, but I had a lot of fun with it.
The voice acting can be hit or miss, with some hilariiously bad lines mixed with some which are fine.
The biggest negative for me was that the game didn't really find a good way to prevent brute forcing the solutions. "Return of the Obra Dinn" had a brilliant solution to that problem, but it would not really be applicable to this game. Still, the way the game is right now, it can lead to you trying out a little bit too much, spoiling your own fun of discovery.

A solid game overall, though.