I feel like the guitar through out the whole track is a bit too quiet, I think it needs to be louder than the drums, because after all that's kind of what you need to pay attention to.
I agree xtreemmak, but probably more than just a "nice addition", it feels like it's missing something without it.
I'm interested to hear what it's like with lyrics, & what you'll come up with or make it about. Also, it's probably easier for us to give feedback that way, with lyrics.
It does sound like you're on to something pretty good, though, so keep us posted