Darkness in spaceship

So, the story is set way in the future, and Earth is totally unlivable. Other planets aren't great for life either, so everyone's just living on these giant spaceships. Our hero lives on one called the Light and works as a super cool special agent. One day, their ship gets attacked by bad guys. First, they unleash monsters on board, and then they send in robot soldiers. The hero has to take out the enemies and save everyone.