This anime isn't for everyone and was probably not intended for the masses. It is a piece of high art.
Story: The story is fine and relatable if you are familiar with anime tropes of the time and can follow the storyline. This anime is dense and doesn't tell you anything. It wants you to perceive the storyline rather than give it to you.
Art: I'm watching a VHS rip on a 40" 4K monitor. Of course it doesn't compare to anything modern. It is on par with many things of the same time period and better than most. They took their time to draw a great animation.
Sound: There is very little spoken dialogue. Most of the anime is visuals and music. The music is well chosen and always fits perfectly with the animation. It is a S tier soundtrack.
Character: They aren't well fleshed out, but they do a lot with the minimal time given.
Enjoyment: 10/10 for me. Otherwise, I wouldn't be here writing a review.
Overall: 9/10 It's just good. If you like old anime just watch it.