The "fly a circle to reload" is a genius way to incorporate the theme. Over all quite polished game, though i could see it getting a bit samey and/or frustrating over time, since it is at times quite hard to line up shots. There is a lot though one could do to take this further. Different planes with different strengths and weaknesses like sidegunners, or a radar, or speed or... see? it already gets me thinking about its potential :D
Well done.