Main message seems to be "don't go into locked rooms when you've been warned not to." Also briefly addresses the old "be careful what you wish for" adage.
Lots of scary stuff. Bloody/gory corpses. Gory wounds and injuries. A young girl is hit by a car. Characters are violently slammed against the wall or dropped on the floor. A young girl brandishes a knife. Toy gun.
A use of "damn." Also "hell," in a faith-based context. "Oh my God" as an exclamation.