I understand what you are saying, but I think it is unfair to say it is uncreative strictly because of it reversing an already existing game since it is very much the theme, the gameplay is not really close to the original game, and if we are judging creativity partially by uniqueness, no one else really made a game about slenderman in general. No hate or anything just wanted to respond with my thoughts about your comment <3
Good luck in the jam and I hope your game does well! :))