They Started It - a chaotic arcade shoot-em-up
We lived in peace for thousands of years, until they came.
Aggressive beyond reason and sporting a dubious dress sense, they attacked in droves; we pushed them back, but they kept coming. Eventually they were down to their last ship.
Still it comes at us, attempting to exterminate us for unknown reasons. Seemingly unable to take a hint.
You are that ship. Leave your morals at the door and destroy those poor aliens for no logical reason.