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From Hollow Rock Entertainment:
Cowboys have settled on mars... and they are not alone in Aliens vs Cowboys! The aliens are trying to destroy the town saloon and you need to protect it! The game is simple, your saloon has a limited amount of life and aliens are dive bombing into the saloon to try and destroy it. Touch anywhere on screen to have your cowboy fire his gun in that direction. Destroy as many incoming aliens as possible to raise your score. The more aliens you destroy, the higher your score goes. But beware... if your saloon takes to damage it will be destroyed... so protect it for as long as you can!Game Center High Score Leaderboards all allow you to see how you compare to all other players around the world.Your high score will save automatically, so you can always come back to try and beat your own high score. Now get to shooting in Aliens vs Cowboys!