This is so beautiful. I've listened to it several times over the past 2 or so weeks and I love it more every time. There's not a traditional melody, but there is definite thematic structure beneath the composition that gives it a huge unique character. A structure I can't really articulate but I can feel it.
Before I read your description, it was already giving me HLD vibes. And that is a huge compliment. Maybe it could be a bit louder? But maybe not, since the dynamic range is really nice. Anyways, this composition gives me the chills. Really love this.