If you're not familiar with the game, in Slender you have to collect eight scary notes at night in a scary forest while a long limbed freak called Slenderman stalks you by teleporting around and tries to telepathically mash-up your mind. If he gets close, you hear a static noise and if you get too close, this overtakes your mind and you die.
SlenderMan is not an exact remake of Slender. For example, Slenderman doesn't teleport his way towards you like in the original but rather suddenly tends to dramatically pop-up on your screen holding his hands out as if he is Fred Astair. There's no static noise too when he gets close and the only sound effect seems to be an owl. The graphics are OK but Slenderman's arms also seem considerably shorter than the original - he looks more like a normal bloke in a suit prowling around a forest.
SlenderMan comes in two versions - 2D and 3D. The 3D version is definitely better although the gameplay is exactly the same as the 2D one. The controls are the same in both and are a bit awkward to use - you can't touch the screen to move about or look around for example as you have to use set buttons.
SlenderMan for Android doesn't really live-up to the original Slender but it's a half-decent attempt and is worth a try for Slender fans.