This is a very curious game. Not quite horror, nor what I'd call a thriller. It's perhaps best characterized as a somewhat dark puzzle game, I'd say. It does try to surprise you here and there, but it's often very reliant on you going along the predicted path, which in some areas, they simply couldn't predict. In that regard, if you're looking for something to scare or frighten you, I wouldn't recommend this.
If you're instead looking for a puzzle game with some visually distinctive areas, however, you can't go too wrong with this. The environments choose style over photorealism, which works to varying degrees (some areas had some visuals that looked slightly off, in an unintended way to me) with it working well, more often than not. I've only played it lightly and already in recalling it, couldn't help wondering whether it had been a dream or an actual memory. As it would turn out, it was a memory of one of the levels in the game, which I think speaks to the striking style of the game.
The story itself is enough to keep you guessing a little and keep you playing, but as I state at the start, you really are better off looking carefully to understand it, as far as I'm concerned. You might be able to get by with the bare minimum, but I know my initial guesses were quickly thrown off by some additional information I found, which is either a positive or a negative, depending on how much you like searching areas thoroughly.
Altogether, I'd have to say this doesn't strike me as being a forgettable experience, so I'd definitely say go for it if you take the above into account and are looking for unique scifi puzzle adventure games.