Yeah, some of the acting in this film is certainly not going to win any awards, but it's really not that bad at all. I've seen much worse from A list actors (I'm looking at you everyone in Killing of a Sacred Deer). And honestly, for an indie movie, it's easily on par with many I've seen.
Visually the film is very good. There are some nice shots, solid practical effects, and good locations. The story isn't revolutionary but I did appreciate the few twists, even though the ending left a little to be desired.
Overall I've seen much worse and this one is worth a watch for horror junkies.