The viewer can take this movie as a metaphorical exploration of grief, or as a literal semi-bonkers subgenre blender. Or both at the same time. For me the metaphorical part works best, but I was intrigued by the literal story until the final twist, which simply felt like it took things a bit too far. The grand reveal seems like it was an unfinished story element that was less important and less well developed than the preceding twists.
The scares, sound design, and pacing are very well done.