Despite one amusing line, some cool death scenes, and an almost okay idea, Exeter isn't even remotely worth seeking out. Given a surprise ending, multiple scenes throughout the movie don't make sense, the characters are utterly unable to actually think about how to escape the situation they're in, and overall, it's just so damn underwhelming.
Have you chanced upon this flick?
(http://fight-evil.com/movies/e/exeter-2015/2.jpg)