This game has really grown on me. When I first played it, I found the atmosphere a bit depressing and the puzzles underclued. However, after revisiting it, I've realized that this game is a true classic. Especially when compared to other mystery games; this one really stands out.
The writing has a very strong style; for instance, we have the following:
"This room is long and thin, like a jailhouse corridor, from the doorway in the northeast corner to the large bay window opposite which stretches the length of the room, overlooking the street outside. The colours are your eyes on a Sunday; red like blood, red like the leather of the over-stuffed chair, which sits a cheap trophy by the main desk. A bookshelf fills the east wall."
The whole game is filled with a feeling of inevitable loss or failure; not of the game itself, but for life in general.
The puzzles are difficult to figure out. For more casual players like me, I recommend exploring until you feel you've seen everything; trying to solve every puzzle at least once; revisiting it after a day; then using a walkthrough. The ending surprised me twice, and even now, I don't really understand all of its implications. For me, this game only improves more and more with time.