I really liked this movie! It perfectly exemplified the dance between illusion and what we perceive as reality. There are occurrences in life that defy explanation and often myths are born from said experiences. Our logical mind always tries to find a matching pattern to better explain things, causing us to sometimes buy into these myths. That is what this movie is about.
The plot smoothly pulls you in and causes you to begin caring for the child and the lead protagonist who is very lonely and harbors many traumas of her own. A myth is presented to her that seems to match what she is experiencing--a pattern match. This realization threatens to pull her and the child apart, yet, is this just her way of justifying her need to remain alone? For as she hints, it is much easier to be alone, that way you never hurt anyone. You aren't responsible for anyone else but yourself.
All through the movie you are led to wonder what is fact and what is fiction. It isn't a gore or even, really, a horror flick. It, instead pulls on our human heart strings and we find ourselves matching patterns within our own life. For I too, have thought many times that it is much easier to be on my own than to experience the bond created between another person. I find myself resisting this. So, I definitely identified with the plot.
The ending is quite good, and just as the bubbles that the little kid had much fun with, they all must eventually pop, as all illusions must. And that is what gives "depth" to this movie.