Further viewings will flesh out the subtext

Rating: Null/10 (11 November 2017)

After watching it a second time, I realized there's more to this movie than at first glance.
The acting is superb. Great atmospheric score and timing and selection of sound effects adds to the viewing. Simple settings also draw one into the film.
Second viewing opens up themes about psychological pain of losing loved ones, the insidious influence of having untreated trauma and stress. It's possible that the monster represents the mother's trauma and how she copes with it, with the ending being a realistic but disheartening revelation (quite refreshing from the tragic or resolving ending).