This made me think that it'd be interesting to see a variant on Space Invaders where you play as the invaders - you would write a little program that takes the

This made me think that it'd be interesting to see a variant on Space Invaders where you play as the invaders - you would write a little program that takes the state of the world and determines the next move for each invader and play against an AI cannon. Does anybody know if something like this already exists?