Normally I enjoy slow burns, but from the beginning of the movie, it tells you that the main character is the ghost. Okay, got it. Then, throughout the whole movie, it throws little signs at you like "look, the ghost,,,, " to make you wonder who she was when she was alive and whatnot.
Considering I was intrigued about what happened, I continued watching the movie. At what was supposed to be the climax, it was the main character discovering everything that we as an audience already knew and had been told throughout the whole movie. The execution itself was fairly poor and uninteresting, and the conclusion that followed was less interesting.
As a whole, I would've liked the story of the ghost and her story that she followed until then, rather than the main character discovering the "truth".