Needless to say it's spacey, droning, tempo-less and experimental, traits that are typical of what we call now "drone ambient".
The three-minutes intro sounded pretty intriguing and "metallic", in a way that makes you feel heavy in a very subtle and dark way. Something I would expect to find in a Steve Roach, Lustmord or early Tangerine Dream album.
The theme that follows soon after brings more dynamics to the track and definitely worth a listen, with its synthy and crisp electronics. Three-chords arpeggios with a minimalist approach and basic EQ, not surprising but not failing either.
Windy pads take their vengeance in the third and final theme, bringing a feeling of slight emptiness, isolation and desolation. So much images in this one, it really adapts as a soundtrack for an indie abstract film, probably dealing with depression and solitude too, or even post-apocalyptic futuristic scenarios. The background sound effects really bring life to this theme, and it's refreshing to hear something different from the bottom-heavy sounds used in this.
It's indeed a nicely structured dark journey to the realms of deep psychology, and the fact that you personally went through that makes the whole piece a little more "genuine". Many would look at this and say it's either "spam" or non-music. It's Ambient, people. Background music at its finest. This perfectly fits into the wide commercially labelled "Ambient" category, as it's a deep collage of sounds, delicately manipulated to bring vivid abstract imagery into your minds.
In conclusion, I wouldn't call this a "masterpiece" (hence the droning and monotonous nature), but it's indeed an excellent Ambient track full of layers and atmospheres, and as you even said, worth for a walk in a serene place away from frantic everyday routine.