Use arrow keys to move the ship. Press Z to fire a laser. Difficulties are an option to be adjusted in the main menu. ---------------------------------------------------------------------------------------------------- VERY EASY - Enemies spawn twice as slow. EASY - The normal rate of enemy spawn. Medium - Enemies spawn twice as fast. Hard - Enemies spawn four times as fast. Brutal - Enemies spawn eight times as fast. Insane - Enemies spawn ten times as fast. Futile - Enemies spawn fifteen times as fast. この世の地獄 (Hell on Earth) - Enemies spawn twenty- five times as fast.
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