The game is incredibly slow, even on a good PC, the visual effects are completely overboard, it feels as if they just clicked all the buttons in Unity because they thought it made their game look "good."
The gameplay doesn't work. I found myself running into invisible walls every minute, with a little message that says "Coming in a future update," as if just adding some basic forest terrains and a fence around the edge of the play field is all that hard. The issue with this is that if you're running away, you'll just run into an invisible wall, with no indication before you hit it since it just looks like normal forest beyond the wall.
Worst of all, as far as I can tell, Slenderman doesn't have any physical presence. The game will randomly play some spooky sound effects, and then pops up the Slenderman screamer, which stays there for an uncomfortable amount of time after the animation finishes, before booting you to the main menu. You don't see Slenderman chasing you, you just randomly die and there is no apparent way to evade him.
All the things that would make this interesting, like the multiplayer that it claims to have in the first paragraph of the description, isn't there yet. As of right now, Slender - New Hope is simply a buggy, poorly designed, worse version of Slender - The Eight Pages.