☆☆☆ Stunning, real 3D graphics.
☆☆☆ Easy but challenging gameplay.
☆☆☆ The most exciting battles you have never experienced.
☆☆☆ Play game with your friends and other players in CO-OP mode.
☆☆☆ 2 characters, 4 totally different weapon systems.
☆☆☆ Tons of dangerous alien invaders.
☆☆☆ Various upgradable items.
☆☆☆ Appealing character customization.