Definitely a nice start, the beat should change, but the buildups are good. I like the intro from 0:00 to 0:10, but the drop is really where some problems come in. The "yoy" sound could be used for some good drops (nice sample you got there, can I have it?) but it is used very randomly. The main problem is depth. I encourage you to add a subtle background beat that is quiet, so it won't distract, but still give tons of depth like a background in a video game. You can also make a quick drum sound quiet and loop it in the background of the drop on every note to add some more depth. I think you should really at least do a different drum kit instead of the default, experiment with the tabs. The saw should really have amplifications. Check out the Youtube video by Lemons, "10 Minute Music." He uses the saw really good for the drop. Also, it's a good idea to try to start small on dubstep. BlueAlpha14 really said a lot of the things I said. I hope this helps you out.