In essence this game is Slenderman collect the 8 papers to complete the game, it was fun to play and does give you a scare but that is due to the obnoxiously loud sound that plays when you are near Sleepman.
There could be a few improvements to make the game scarier to play , here are a few suggestions:
-make the ambient lighting overall darker, there is no use for the flashlight at the moment
-add ambient fog and reduce visibility so it is harder to navigate
- add small catacombs/mazes and places that are harder to get out of or run from Sleepman
- add messages/drawings on the back of the papers to add some kind of lore for Sleepman.
These are of course just suggestions, overall the game was good despite its simplicity, it will be interesting to see what future games are developed by this author.