Good stuff.
Nice dubstep, love the wub.
My only criticism would be that the bass is too hard. I would suggest a deeper, more intense bass and use a DnB rhythm for the melody. The background that started playing at 3:40 was very nice; it fit the theme of the song beautifully. Maybe add more of that?
It's your song, though, and I'm nobody to tell you what to do with it. :)
All in all, very cool stuff; I see a lot of potential in you. Carpe diem!
4/5
9/10