Zektor

Zektor is a shoot-'em-up arcade game developed for vector-based G80 hardware, very similar to Atari's Asteroids.

A fixed-screen, overhead shoot 'em up featuring a controllable ship with thrust and free rotation capabilities, similar to its predecessor Space Fury (and ultimately to Asteroids/Spacewar!). Your mission: infiltrate and recapture eight cosmic cities, presently held in thrall by a group of eight alien robots.

Each of these mechanical antagonists (some male, some female) will taunt you in its synthesized voice as you approach its captured city. Once there, you must power through three waves of defense, consisting of drones and fighters - some enemies may be shielded, requiring multiple laser blasts to take out. Down the screen travel the indestructible Moboids, which come in three flavors (one sends ships into an uncontrollable spin, another bounces them away, and another destroys them on contact); the playfield doesn't wrap around, and bumping into the surrounding force-field will kick your ship back.

Once the defenses are repelled, you will arrive at the city itself, where you'll face off against its robot conqueror, surrounded by concentric, rotating shields (a-la Star Castle). The robot will lob energy blasts at you as it tries to escape; if you manage to sneak a shot through the openings in its shields, your award is an extra life.