Decent watch, if forgettable, at best, won't watch again, and can't recommend.
(Please keep in mind that the mobile app erased my original review, so I'm a little peeved.)
My biggest concern with this movie is that it concentrates on fear mongering against technology more than creating a good movie. I understand that it's supposed to be a psychological thriller, but that should be what you're concentrating on and not teaching the audience to fear technology: just tell the story.
In fairness, it did do a lot with a clearly low budget: low level actors you won't recognize and (mostly) kids for background characters, Google Glass (or similar) tech, an underground bunker setting, and not particularly great cg effects, but they managed to get by.
The real crux of the story is that isolated in a bunker, they kind of think they're going mad, so "what's real" comes into play, and then it becomes the inevitable question of "is it me or is the technology out to get me", and when that tech is a virtual OS (think Cortana), then there is no telling what is going to happen so there is no expectation, thus nothing to subvert. Its a rule in both Horror and Comedy to play with the audience's tension / expectation (Rules of 3) to establish a pattern, and then break/deliver on it in a surprising manner.
The camera work also messed with me quite a bit. Not only do you have a switch between natural 3rd person camera work and 1st person perspective, the camera work alternatives between almost imperceptively still and wildly jerk about as the audience was intended to experience an earthquake. It feels like the movie was trying to be "Hardcore Henry" esque, but didn't actually do anything special with the camera angles and distracted with the Head's Up Display (HUD).
There's a movie here, you might even like it, but I'm willing to bet that the movie is too unique without much spectacular happening for most people to enjoy it.
