So guys, just a little heads up. I just opened the game after around a month or two from my last time playing it, turns out they updated it. So I updated my game, and now, it's actually a 50-60 minutes long game, containing everything you see there in the trailer.
No more beta, no more eight pages to collect, you'll see things, horrible things, running at you, jumping in front of you, you'll cry as you have to go inside a dark tunnel when it's nice and lit up by the sun outside. You'll simply have to worry about things other than your usual experience with slender.
Enjoy!
Oh and one more thing, I've played a lot of horror games, countless of them, none of them managed to plant fear into me (sure jump scares worked for a couple milliseconds before I held out my gun and shot them in the face). The only game actually scaring me ever was amnesia the dark descent, and slender was a bit of a far second. But this one is just, probably as equal, as much as I hate to admit it.
So be sure to keep a couple extra pants lying around, you'll need them.