bill's Super Shooty World

Control a robot named bill. Shoot 4 brown enemies or defeat a boss to pass the level. You can collect items to help you.

Now here's the throw away story for the game that is not actually mentioned in the game: 

This is bill. He is a robot. He comes from a race of robots who were programmed with an uncontrollable urge to tuck in chairs.

It's their mission to conquer the universe, not to enslave, but to make sure all chairs are tucked in. Any dissident races must be wiped out! (the brown enemies in this case)

That is bill's mission. That is all the story you need to know for this game.