I'm not saying slender is scary. It's an engrossing experience the first few times, and it's really about survival, but it can give a pleasant jolt of adrenaline when played. I don't care if it's hipster to say the meme has reached pop-culture status and now everyone and their dog know of the Slenderman idea...if you don't like it, don't play it. I'm not twisting your arm!
Admittedly, from what I've seen Amnesia IS the tip-top of suspense/horror. But alas, Slender is popular, SIMPLE (that's key! No story to distract from the gameplay here), and effective...and the game that was created already? Yeah, that sucked, and didn't resemble at all what I was describing.
Everyone knows those zombie killing shooters? The ones that are either "defend your base" or "explore the building"? THAT'S the style I'm describing, with the light effect used to explore the rooms. Looking down UPON your character, not from the side. I don't know if THAT'S been done, but I think the effectiveness is two parts: proper visuals (which can be simple, not intense or in 3D or any special effects) and proper SOUNDS. The right sound and atmosphere can make the game pop out. Even one as simplistic as a 2-D survival horror.
I'm saying, it CAN be done, and if done right, can be VERY good. But hey, your opinion is just as valuable...all I'm asking is that you don't meander off into hipster arguments about how lame Slender is (hey, whatever floats your boat!) or how it's been done before or it's too stupid now that everyone knows about it.