The dialogue is so transparently contrived you cannot take seriously that a human being, let alone a pair of them, could possibly be so deliberately unhelpful, obfuscating and unreasonable.
Reminiscent of The Cube but infinitely less self-aware, bluntly, the writing is too stupid to allow even the most credulous of audiences to enjoy the premise.
The performances are emotionally convincing, and camera work is laudable given the budget, nothing can save the film from writing so disingenously unlike a real person. You spend the entire time frustrated that the characters won't utter a single coherent sentence. Beyond that, the exposition is blunt and choppy, the characters' decisions make no sense, the emotionality feels like the writer has never actually met a human being.
No decision in the entire film, either by the characters, writer or driector make any sense. It's incoherent from opening to close.
Just a disasterous waste of decent acting and a potentially interesting idea.