This is clearly about Karoshi, the wonders and inocence of a childs point of view contrasted with the brutality of the short tales that point out the demise of a man in the top and the hell of being the man in the middle, followed by a return to all the fanfare of infancy. This more arthouse... So expect iconography instead of story telling. Although that increases replay value, it makes rough to enjoy it in an ordinary day, the soundtrack makes a throught-line that helps connect the dots, but everything is quite subjective. Pay atention to the settings and you will understand mirroring dualities offantasy and hard scy-fy, in the world of the child versus the world of the adults. Its not subtle nor inovative, but very clever and has a good message with all its roughness.
The core message aged very well, since its a timeless struggle. Yet the art-style is definitely retro nowadays and to whoever does not appreciate the feel of it. There is no 4K version of this that I'm aware of and this is can scare of some of you.
Returning to the art-house part, this is where I understand if you get lost... Thing is, I love it! It goes straight into the madness, a paragraph or two of context and now here's the story. It works on your empathy and the settings, the places, the body language tells everything you need to know. This is a great ova. Short and sweet.