I'm not picking up the 'ducking', the bass drops out for a beat but that's all I get.
When I listened to it, I didn't really know it had started because the intro is so quiet!! I see what you're going for with the gentle fade it, and I really like the thin tone you've got there, but the whole thing needs to fade much quicker to a higher level. It doesn't need to be quite up to the full tone level after it, but it needs to be comparable.
For the record, I am NOT saying get rid of the dynamics, just they need to be more audible.
You need to trim off the first 9 seconds as I can't find anything there at all
The next 30 seconds of fade should happen in nearly half that time in my opinion, because you listen to the fade rather than the music.
Finally, the intro needs to reach maybe another 5dB before the main kick in at 50secs.
I'd say that was the only negative I've got, and is probably because you know the fade so well, you're prepared for it and it's tempting to make it more subtle, but other people with "fresh ears" won't hear it like that.
Other than that, nice job, in particular the vocals which I really REALLY liked. The tone and the delay really work well together. Thumbs UP!