I like the vibe on this one, I know it may sound strange but it's like a mixed feeling between the German series Dark ambience, and that of Westworld. Given both shows depict parts of post-apocalyptic worlds, I'd say it really fits the idea of a character with some unknown fate within some old underground ruins. I don't know if you have the story figured out yet, but congrats on this nice soundtrack, it shows great promise for an upcoming game!