20 years ago, aliens attacked the planet and easily dealt with the defenders, who were completely unable to resist the incredible technology "guests". We could survive only those who managed to hide in underground complexes and shelters. After two decades, humanity has finally soldier weapon which puts it one level with aliens - it's exo-suit. Dressed in his pilot can fly in spurts, make sharp jerks up and periodically release missiles at the enemy. But all this requires energy, which is to collect and save for emergencies. Passing collecting coins will open a new, more powerful model of technology and fresh recruits ready to fight. Break through the defense to find vulnerabilities and apply the devastating blows that will cause serious damage to enemies.