Quite frantic in the last levels, it's pretty hard not to destroy too many civilian ships (I didn't notice the acceptable failure quota UI actually, but didn't fail anyway).
It's fun to try to anticipate the other missiles / ships trajectory, although it changes a bit too frequently to feel smart in my opinion.
Not sure if it would be too harsh or not, but maybe having a missile reach the end of the screen should have a malus too ? Currently, it kind of encourages to have 2 missiles on the edge, not risking to damage the civilian ships, and focus on the 3rd one.