I bought it the other day and finished it, took 7 hours which is pretty good for the $20 I paid for it on steam. It took me an hour and a bit to earn that money.. So I figure 7 hours of pleasure/total fear for 1 hour of work is pretty good. I guess I must have missed the sale! There was a bit of criticism regarding the game length.. But it makes up with quality and anyway, the call of duty campaign only lasted me 4 hours.. Plus they released a toolset so hopefully some good custom stories get made in the future.
Overall, it's a great game. Frictional Games is great at making these sort of games. Hell their much older 2D game (freeware on their site) "Fiend" is scary as shit!. I think I felt a lot more tense during Amnesia, I found myself clenching my jaw at times when I was anticipating a monster.. They were a lot more horrific than Penumbras..
Scare Spoiler
Early in the game, the archives I think, you go in and hear a piano playing.. I didn't know what the monsters were like so it was pretty spooky thinking something in the other room was playing a piano... Then later you hear metal clanking and hear some music play and some monster noises.. Which you later associate with a certain monster.. Terrifying thinking you are so close to one of those things so early..
It's so great.. I might get another 5 or 6 hours out of this if I play through with the commentary.. Though a lot of my play time I was probably not advancing far because I was too scared to enter a room where I thought I heard sounds or spending like 5 minutes in a cupboard daring myself to get out! Haha.
Another thing I liked is how they present the story, in notes and aural flashbacks. I love piecing stories together, which is why I loved Penumbra. I don't know why I compare it to Penumbra all the time.. Similar gameplay though.
The setting was great, very creepy.
Great game, I love these sorts and am anticipating the next survival horror by Frictional Games.