Cosmiads

Cosmiads is a Galaxian variant where you must defeat waves of swooping alien attackers with a spaceship that moves back and forwards across the bottom of the screen. When in formation, the attacking ships are coloured and worth 10 points each. When they swoop down to attack, they turn white and are worth 100 points each. After all of the regular ships are shot down, two larger shielded vessels begin to attack, and these take multiple hits to destroy. Once these are dispatched, the next level starts with a slightly higher speed.