Amnesia Lite?
More like Amnesia "right". Death is final, there is actually pressure to keep moving (weak battery, and getting weaker over time), and a very disorienting and oppressive environment.
Slender feels like a nightmare; comparisons to nightmares are made easily nowadays, but this game really pulls it off. The "music" such as it is slowly wears away at your fortitude like the gears of madness (compare to the soundtrack of
Quake 1- demonically delectable). I knew I was in real trouble when the flashlight started getting weaker. How much longer did I have? Out of morbid curiosity, and a little fear at losing my only companion, I turned off the light for a bit, perhaps to see if it would recover. After all, if I'm to try and navigate this oppressive gloom forest, I want as much vision as possible. Alas, no power was returned, and I only had a few pages. I thought I noticed something odd when the light was off earlier, so I switched off the light again...
...and in light of my rapidly decreasing power, I was almost relieved to be finally apprehended by my eldritch pursuer. Never you mind my hammering heart.

Has anybody actually managed to win yet? My only complaint is that actually gathering all the pages will probably require quite a bit of metagaming (aka multiple tries). I'm less concerned about the scariness than the patience required.