Thoroughly enjoyable movie. The movie kept you in enough suspense about where the direction of the movie is going. Is it ghosts, is it aliens, is it demons from hell, or an experiment gone wrong?
The chemistry between both protagonists was great and I could feel myself really liking and rooting for them even given the circumstances around them. Both of them were competently acted and as a person who is from the defense industry, I could see they did some homework on weapon manipulation, movement, etc which was refreshing to see.
The failure in the movie comes in the last couple of minutes. I felt the ending was a bit contrived and rushed; like how did this guy randomly find her in the end? I feel the ending could have been worked a bit to add maybe 10 more minutes of screen time to not end so much like a romance movie. You could have seen his emergence, his journey to get back to her, missing her by just a few moments, OR you could have cleanly ended it right as she's crying and he comes up and finishes the poem and it cuts to black with the audience feel joy.
Otherwise I enjoyed it, and I can see how Miles Teller is popping up more and more and can easily become this generations action star along with Chris Hemsworth.