It's all 'round pretty good. I really like the synths you used for the melody, and I thought it was a pretty cool break beat.
Still, I think the master volume's too high, and your drums could use a bit less compression. I'd also like to hear the bass a bit more clearly (maybe tweak its volume up a tad and then lower the master?).
So, all around, I'd say great riff/melody and well-looped. It's a really seamless transition. Just fix the EQ a bit, and I'd give it an easy 5.