Everything sounds pretty good and tight. I like this! is pretty good. I honestly don't think you need vocals (unless you already wrote them). I think this works great as an instrumental piece.
In terms of feedback: Me personally, I don't like how the drum sounds. Not saying it's bad, just my personal taste. I would have done a something different leading up to the shred part, maybe explore the neck a little more. But again, that just my personal taste, it still sounds pretty awesome.