Press the start button first. Then, the level selection screen will be displayed, so select the level you like. The higher the level, the stronger the enemy. Use the right and left keys to move the earth. Fire a yellow ball that attacks aliens with the space bar. If it hits an alien, "enemy HP" will be reduced by 1. Also, firing the yellow ball of attack will reduce the "remaining number of bullets". When the "remaining number of bullets" becomes 0, you will not be able to fire. The "remaining number of bullets" will recover after a while. If you hit the blue ball of the attack from the alien, "HP" will be reduced by 1.
地球を守れの英語版です。 This is the first work to protect the earth. The score is calculated from HP, the number of remaining bullets, and enemy HP. ・ ・ ・ Production period 1 days ・ ・・
