(Note - I review pretty harshly, so don't take a low score personally! I don't vote harshly.)
The mixing and mastering is spot on. Great work. The main reason that I docked points was because the song has essentially no melody. It could be a personal taste thing, but I really really like to hear a good melody, and I feel like a song is lacking without one. It's like a story without a plot. It's possible to accomplish, but difficult.
Anyway like I said the actual sound design etc is really good, so keep it up. I scouted you for the audio portal.
Thank you for taking the time to listen and review!
Please contact me if you would like to use this in a project. We can discuss the details.