Hmmm....
It's a start, but that's all. Granted this is a demo, but even for a demo this is pretty simple.
My suggestions to make it better are gonna be kind of obvious.
1. Lengthen it.
2. More instruments
3. More layers
4. More percussion
5. Varied percussion
I'm not trying to be a douche, but asking what people think you could do to improve this song is almost to wide of a range. Because it is so short and simple at the moment, that really it needs everything done to it.
Now don't get me wrong, it sounds cool. I'm not saying it doesn't sound cool, but you should put a little more into something before asking for advice. Unless you have very specific questions you are asking.
This is a good start, but for the most part is too simple to really give any solid advice on. It is impossible to really tell where you are wanting to take this song at the moment. So commenting on it is difficult.
3/5 and 5/10 overall. Good start.
-Gravey-