Your objective in this space shooter is to wave through enemy waves and defeat boss at the end of each stage. you can upgrade your ship between levels. you get 9 upgrade points when you start a new game and then you get 1 point extra by gain up a level. use the arrow keys to control your ship. press "z" key to fire (main, missile if any) and use "x" key to lock on laser (plasma strike). check in-game help for more tips and tricks. have fun!
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