Reading through other comments, I see you originally had the ship move using the arrow keys to fit the theme. I will agree that mouse movement is snappier and likely more fun, however moving to mouse does stray away from the theme as there really isn't anything else that ties it to that.
The only other gripe I have with the mouse controls is that the lasers don't actually shoot towards the mouse, they shoot off center from it, but off center in different ways depending on where you are facing.
With that said, very well done game, very fun, was enjoyable to play.