Press CTRL to fire the standard weapon and ALT to use the extra weapon, which is shown in a box at the top of the screen. When you die and your standard weapon is powered-up you don't lose it, instead it is powered-down, so you still have at least something.
You can select level easy, normal or hard to start with 7, 5 or 3 ships. And you can set the shield to easy, normal or hard to start with 9, 6 or 3 shield units.
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' (Midikid), Kim Eun Young