Doesn't worth it...
Not scary, the slender man doesn't move in the dark, he only blink when it's like 5/8 or 6/8 in the original game.
5 pages... the first play I've made 3/5 easily... and I'm sure to know where to find each of them now.
You should have used a cone of vision, it restrain the vision more and let you the possibility to program the slender man to move in the dark.
You can make the sound more scary... missing the "heart beat" sound of the original game.
It's the end when slendy blink on you... originally, the player is able to sprint and can have a few time to flee.
After some other tries, I found another sound: when slendy blink near but not on you... nearly nice. Also saw the randomness of the page positions.
Not the first game, so I rate normally. Graphics: 16 bit graphics chosen but it's likely ok, sound: good, gameplay: not enough. It's a remake with another angle of view, so can't rate on scenario or originality.