I recommend playing in fullscreen. Survive for as long as you can in Slender man's forest by moving with the arrow icons and collecting batteries to keep your flashlight working. If your light runs out of power, you can not move. Turn the light on/off by clicking the flashlight icon. TIPS: Turn your light off when you hear Slender man preparing to teleport. This will make it so that he has a chance of not finding you when he teleports. If Slender man teleports in front of you, run. If you look at him for too long, you will die. You can not move when your light is off, whether it ran out of power or was manually turned off.
Inspired by Slender: The Eight Pages, by Parsec Productions. @CANSLP for some helpful suggestions. :3 All scripting and art, except for the static by me, @leFox. Sounds are from Freesound: "High Pitched Static," by 18hiltc (https://www.freesound.org/people/18hiltc/), "water step," by nathanaelj83 (https://www.freesound.org/people/nathanaelj83/), and "mega-thunder.wav," by Erdie (http://freesound.org/people/Erdie/)