Not a bad start
The drums were good but the main bass. . I dunno it started out pretty good but it got hard to follow, it sounded like you were switching key signatures too fast there for a bit,
Also what do you produce with? If you use FL and Sytrus for your basses (and if you don't, it's fantastic! Check out my Misc track for some of the stuff you can do with it)
Basically what gives a lot of dub tracks their feel is the same note wobbling at different speeds to go along with everything else.
If I can help you, shoot me a PM and I'll be glad to!
Also try adding a little more Bass into the main instrument, it sounded a little too high, or not enough power to it, either or. . .
Also it didn't loop well. If you develope it into a song that won't be a problem
Keep working at it!