Returning the favor. :D
The introduction has me impressed already... awesome hits! :D Though it's sounding more like trance than DnB. It's almost professional-sounding but sounds like a different genre.
The arp changes throughout the song and in parts it hurts the quality. Careful there... in parts of the song, it really becomes loud, to the point where it's more than a relief that it becomes quiet.
The drums are more trance drums than DnB drums, easily. Trance drums... they're just like what you have. DnB drums are a bit different - they're usually based on a kick and a snare drum, with the kick on the first beat and the third offbeat, and the snare on the second and fourth beats. Often there'll also be a closed hihat on all of the sixteenth notes, or a ride on each beat. But here you have a kick on each beat, and a clap on the second and fourth beats, and a hihat on the offbeat, which essentially make up standard trance drums.
Genre aside, though, it's not that bad a song. With a bit of cleaning up on the arp's part, and a better kick (you could use a bassier one, I think) I could imagine this song playing in clubs. (Which would also justify its lack of diversity, hah! Next time you try for this song, aim for a melody.) And... the title Heavy definitely fits. :D
Good job with this one... here's my 4. :) Keep up the good work.