Considering that it's a work in progress, you definitely have the right idea about what should go into this song.
Dubstep changes its drops in unexpected ways, and this work is no exception to that.
The mood of this song for me changes from a contemplating sort of quiet calm, to a nice set of beats in the drop, and back again in the end.
However, around just before 0:30 to 0:41, there are some empty spaces that you can fill up between the bass(decreasing pitch).
All in all, this is an exceptional piece of dubstep, but the background just feels a little empty sometimes. Just take your efforts a little bit farther to maximize its potential.