It is very pretentious though.
This is a one-man live action dream, a nightmare or a trip. It has a single track plot, nauseatingly slow with chaotic details and a few peekaboo scares. It reconnects with reality and speeds up closer to the end.
Monsters and vfx here are not to amaze but to add to sophistication.
Somber and ethereal music makes for a more enjoyable experience.