I Became Alien Overlord

Our protagonist found a 2d game app in his phone, he play as the leader of a planet fighting invasive species and reach the end of the game. However his game was updated and turn into full 4k HD, and he was no longer in his home planet, but on earthmoon! Everything he build will appear on the moon it self.  As he slowly build his empire back on the Moon, Many people believe that the alien come to conquer human. they even attempt to nuke the moon. only our protagonist Who know the truth, "I became alien overlord!"