Neat...
This would be perfect for one of those horizontal scrolling space shooting games.
I think you could add a few more sounds to get a bit more dramatic effect. Maybe lengthen it another minute or two. Cause if you are playing for any length of time, the longer the song the less likely it will get boring after playing a while. Just a thought.
But overall nice job. 4/5 and 7/10, cause it could use a little something more done to it.
-Gravey-