As a technical artistic piece demonstrating the expressive power of stop motion cinematography, it is a triumph. As a story, it is a eighth grade goth kid sitting in the back of class, doodling their inner turmoil and profound nihilism. Most of the metaphors relating to our world (e.g., work, medicine, military, birth-rebirth, religion, etc.) rarely rise above that depressed 8th grade standard. Still, I'd rather watch this technical masterclass in cinema than yet another vanilla film that is little more than a pile of cliches. You will certainly not forget it, and the ending is worth staying for as it veers into the best kind of psychedelic metaphysical territory.
WARNING: would not recommend tripping while watching this, you may have more than a panic attack.