Xenos is energy which has been found for the good of humans but, as always, some bad guy abused it. And you are the mech-robot which must stop him.
You represent the last groups of free people and you face the danger and enemies alone. Hundreds of enemies await your pair of weapons. It’s great action because it’s always about some activity and the “charging effect” is nice special content. Plus and minus goes for huge number of levels which could slow down the gameplay. All is packed in a nice graphics which changes as you progress in the game.