It pains me to see that such a good song...
..doesn't get the recognition it deserves, and I know the feeling. At the time of writing this review, it has but over two-hundred sixty listens. It really makes me wish that Tom had a treasure hunt for audio submissions, as this doesn't need to be overlooked.
I, myself am not too familiar with the current styles of modern music, but I really love the mood this piece sets. Such a mellow and cool feeling song is something rare to find on the Portal these days. The slow, but driving groove behind the song whisked me away to a different world, as your voice guided me like a spirit through the ether...
As far as constructive criticism, the only thing I can think of is that the song should be able to end with a bit more finality, but that's just nitpicking. It sounds great the way it is currently. I'd also mention something about including more dynamic contrast, but the low volume the song takes itself at is what give it its distinct feeling.
And lastly, would you mind sharing the inspiration behind the lyrics? Other than that, great work, and it would be a pleasure to hear any of your future projects...