We have all seen that horror movie where some dumb girlfriend goes into the creepy dark monster dungeon looking for her equally dumb boyfriend who was just killed by the monster only to be killed by the very same monster as punishment for being dumb. That is this movie, so you have already seen this movie. If I had to write a 2 page essay on the topic of what was unique about this movie, I would receive a failing grade. There is pretty much no question that this is a somewhat late attempt to cash in on the slenderman meme. If I had to describe the personalities of the lead characters in this film, the phrase "very afraid and doesn't want to die" would be used repeatedly. Many characters literally have no distinguishing personality traits beyond that. At least in crappy 80s horror there would be the jock and the bimbo and the nerd and the coward etc. Different characters to create some variety and keep that character interactions dynamic. The monster itself is a cartoon and the practical effects were basically the bare minimum (blood splatter, corpse without its head, etc.). Expect a lot of off screen deaths.
