If you want to play a game about urban exploration, this is the best thing you can get. It's a very atmospheric and lonesome game about delving into abandoned areas and taking evidence of anything that's not up to code, which there is a lot of since you visit places that are progressively more and more falling apart. It's just you and the environments, you get to explore at your own pace. Along the way you'll eventually have to do some puzzles to progress, it's a bit like Resident Evil without zombies.
But it's not a shallow game, piece by piece you'll learn about a conspiracy hanging over the city, one connected to it's worsening state.
Strongly recommended to anyone who likes slow games.