I my self think you can set this game apart from other slenderman games like [slender] and the rest XD
but if you do take time put hard work into it it will be fun even if its just like slender but you
may like to have something that gets seen as more then just some other slender game
the best thing i can say is make it your way thats the best way make a game you like and make it the way you like
This is my idea of a good game down here you don't need to read it
Also a way you can set the game apart very much is to have it so players can make there own maps and even game types maybe and play with more then 1 player
But if you ever are looking for ideas heres some
Make a game that is as sandbox as Garry's mod with as easy of building as minecraft and as scary and fun as can be
Hope the game is fun and becomes known best of luck
Sorry if my english is not as good you fancy men
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Tony Phillips