Rather good.
A few points to make on this loop. The one thing that docked the one star is the instant cut off at the end of the song before it starts up the loop again, which didn't go well to my liking. Otherwise a great song. A fast tempo with a harmony that actually syncs and flows with it, neither overpowering the other.
Either a lot of time went into it, you have a musical talent, or just plain lucky. Good Job, and hope you create more like this in the future.