Alien Siege is a modern space invaders style arcade shooter, in which an alien spaceship attacks Earth. It is advanced enough to make it to Earth and equipped with laser cannon to wipe out human civilization. As the aircraft floats across and down, player’s objective is to shoot lasers and destroy buildings. Once the city is leveled the spaceship landing is secured and users can proceed to the next level. Unique score for lives trading system is incorporated at the end of each level which allows players to be more strategic in how they play the game. Game-play is simple and fast paced as players battle their way through different levels.