Agoraphobia ... but is this what this is about? Does the mind of our main character play tricks on her? And is that a pun considering what the story later reveals to us? Yes there are twists and I understand that some watching this may feel offended by how the movie evolves and develops. But if you don't have love for low budget movies, than this may not be for you from the start anyway.
This is about the intriguing story and how it is told. Does it have flaws? Yes! And too few also. But is it able to grip you and hold your attention until the end with the story and how it unfolds? Also yes - if you let the movie of course. Taste in movies is something that makes us discuss and also disagree a lot. I expect this to be the case with some who feel very strongly (negatively) here ... but that does not change what I felt while watching this. It is good for the budget it has and for mystery it serves the viewer. And the reveal is more than fine enough (with me)