Cool idea but you can just stay separated as far as possible and get every astroid. Maybe there needs to be a max distance the two points can be apart?
Good point. I have allowed spawns slightly outside of the screen, uncatchable if you just stay further apart (you have to destroy them by moving on the same side or they'll pass through) so at some point you're going to lose if you only stay on the opposite borders, but yes it's still an issue.
