Well, this was straight up my alley. Squarely in my comfortzone. Apparently I feel comfortable exploring the dimly lit streets of a gloomy abandoned city... (huh, what does this say about me, I guess...)
And exploring you must do. Since Nightfall is basically puzzleless, it's all about looking around and solving the Big Puzzle: Who is She?
While you search around the big, big map, some locations will trigger memories, which can be RECAPped to get a picture of this mysterious person you've actually half-known most of your life. Glimpses into her inner life, helping to make sense of what's happening this night.
The author has included some helpful commands to help navigate and keep your place in the story. (GO TO, REMEMBER, THINK). These are a great help, especially since the PC has a lot more knowledge of the geography than the player, and because it's easy to be unsure about what to do next in such a big city full of possibilities.
Writing and implementation are very good, good enough to have you wandering around Xing everything and forget about the time.
Yes, time matters in this game. You have to find her in a certain amount of time or ... Actually I don't know. I found her by 01.37am. I have no idea how much more time the game goes on for. (You can check the time limit in the help menu at the beginning of the game if you want.)
Depending on the route you took through the city, the locations and objects you examined, you get a different ending. (I got a "losing" one I think, but I liked it nonetheless.)
A game with great atmosphere, it deserves to be played/read attentively, best of all in one or two long stretches.