Pretty good, but I think the volume could be more balanced, it seems if you the volume up high enough to here the none drop sections, the drop will just hurt your ears. The mixing also seems to be a bit strange and it gets kinda repetitive. Maybe I'm being a bit harsh.
Altogether it is quite good, though. Here are some things I enjoyed:
1. The melodies are cool and catchy.
2. The drums do their job well.
3. The transitions are clean. TIP: You don't have to, but you could add a cool and creative transition, using a slide note or something if you can.
4. The ending is nice.
Keep it up! (:
Edit: Well, what I mean is, in the drop it feels like it's just a bit empty. Is there really quiet things in the background or not? I don't know. It just feels strange. I don't really know how to describe it...