Interesting...
This has serious potential. And I really mean it.
The beats are in your face all the way through the entire loop, and I have a feeling that was intentional. (I say loop because it is far to short to be a song.) I really like the beats, and especially the few fills you created. You should make this a bit longer, and vary the beats/fills some throughout. That would be pretty sweet.
As for the melodies, they are beyond simple. But it really gives this song a charm about it. You don't always have to get extremely complicated to get your point/idea across. Sometimes simple is simply better. I do believe this to be the case for this little diddy.
I think it could really be helped with a bass line of some sort. Nothing overly complicated, unless you want it to be of course. But something to help bring some balance to this. It is pretty top heavy throughout in my opinion. But it is simply that, my opinion. So take it or leave it as you will.
Overall this is a good start, like I said. But it could really be expanded both vertically with more instruments, and horizontally with more sections.
3/5 and 7/10 overall. I hear some serious potential, so don't let this sit and collect dust on your hard drive! :-P
Best of luck bud!
-Gravey-