allways check your tracks.

your High hat track at 00:01:40 is way off. if you meant it to fall on 3, then it's way too loud Throws off the groove, and sounds annoying.

Also along with what cypher said about dynamics; use volume throughout your groove. As it is- your instruments are either playing, or they arn't. you should decide on a "flow" (where you want more, and where you want less) for the whole peice.

changing keys-- @ 00:01:50 through 00:02:10 you have a bassline fading in, but it's not working because the two keys don't have that note in common. If you are commited to having that bass atart early, then I'd match it to the current key, then take an extra bar to resolve it into the new key.

All that aside, it's a nice sounding track.

well...

1. Add more instruments
2. Slowly build the atmosphere ( at the beginning, start slowly and quietly, and slowly increase the tone as you go.)