Great concept.
At some point (but maybe that's me just being that good at the game) it became a little irrelevant to turn my spaceship around and I just let my cannons attach whereever - it would been nice if they would only shoot straight or something - so you had to juggle between rotating to position new cannons and rotating to align the cannons for them to shoot at the enemies.
After the 30+ tiles, I just kept my spaceship sit still ... the cannons would turn around to shoot and new tiles would float towards me nevertheless. So it was quiet an easy win ^^
But great submission!