not too bad
I'll begin, by stating that I haven't heard much zero wing music before (just ayb), so I can't really compare whether this sounds like ZW or not music or not. Even so, the music isn't horrible, and a person could make it either battle music, or a title screen theme.
Why did I not give it a higher score? The quality could be a little better - it sounds like the microphone is on one side of the room, and some of the instruments are on the other side. It could be compared to listening to it through a tube of some sort. I'm going to guess this is probably merely because the room this was recorded in was echoey.
Beyond that, though, the song was fairly decent, and I caught myself tapping my foot to the beat on occassion.