TopFreeGame Inner Defense 2011-11-28 Inner Defense Asteroids Games 1 Player Games Defense Games Shoot 'Em Up Games Shoot all the monsters as they appear. Shoot whatever they separate in to also. same as asteroids. Alternative content Play Inner Defense Full Screen Inner Defense (Full Screen Play) Inner Defense Game Controls Left / Right Arrow Keys - Steer. CTRL Key - Speed Up. Shift Key - Fire. Down Arrow Key - Reverse.