I think it captures everything you set out to do. It's not like other dubstep. Yours actually has a melody and not crazy beats. It definitely has that dark feel to it though. i like it. And i think you learned the essence of dubstep and executed it quite well. Sounded pro to me man!
Keep doin what you're doing!
Please contact me if you would like to use this in a project. We can discuss the details.