Firstly, the film uses excellent ambiance and sound to draw the audience in. The cinematography lends itself to the period. The relationship tension serves to set the tone of the film up until the catharsis. It teases jump scares, relying more on suspense; delivering a truely scintillating sequence between the haunt and the lead. Undoubtedly, a good after midnight film when you don't want something too scary but want something gripping.
The dialogue could have been better linked to the bible; It would have made the character's return to faith more concrete and enjoyable. The jaded nature of the protagonist makes the character arc quite satisfying, even though it's somewhat understated. It's beauty is in its minimalism, and the set does a lot of work for the feel of the film.
Unanswered questions allow the audience to imagine their own narrative and is a welcome style choice.