Serene and contemplative, it makes me think.
This piece really does hearken back to your older vocal works. Now let me assure you, the 10 is justified; the cavernous consonance following each phrase really fills the pauses, keeping me attentive for the next segment. Plus did I mention that the bass seriously succeeds in delivering that "exploring the dark and dusty monolithic sepulcher" feel? Throughout, this piece conveys to me a peaceful state of mind. It's good listening for when one just needs to think about stuff.
If there's anything to improve on, I feel like you falter a bit on the high note on 1:36. I can tell you wanted that voice to lead the progression. Perhaps if you balance the chord so that one voice does not overpower the others (too much) while still keeping that crescendo.
All in all, for this to be assembled entirely out of one person's vocals is pretty impressive and I think you did a hell of a job. You don't see too many submissions like this in the Audio Portal. Nice work.