Very immersive and cinematic, the sound design scratched just the right part of my brain, I could totally see this as a soundtrack. Amazing work on the ambience ! I want to see more of your work.
However as you said, the melody doesn't seem to be the main focus in this track. It's there and clear, but doesn't develop very much and stays in the background. Feels more like an ambient track than a leitmotif track.
Melody clarity 4/5
Melody Impact 2/5
Composition 5/5
Listenability 5/5 (sounds very professional)
Correlation to theme 2/5