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!