Start a crazy shooter game adventure against aliens! Take your best shots and defeat all the enemies. How To Play Played with Mouse. Kingdom Defence Alien Shooting Game Features ✓ Arcade sounds ✓ 2D Environment ✓ Realistic particle ✓ 2D Character Finally, you can enjoy these game for free (and more requests will be added)! Kingdom Defence Alien Shooting Game extension does not contain any hidden ads. Help and Contact Contact with us at info@gamebol.com and share your thoughts and problems.