The goal for you is to defend yourself and seize the chance to attack your enemy. When the energy changes or the weapon is unselected, you must defend the space eye from enemies attack. Use left and right arrow keys to rotate shield. Pay attention to your energy bar. Some weapons need 1 bar energy to be accessible while some others need 2 or 3 bar energy, so choose the appropriate weapons. With your weapons, you should click the mouse button to shoot at your enemies, try to clear them! Come on and good luck!