Anarchy is loosely based on the classic coin-op Defender. Instead of humans, the player protects canisters. Also instead of the player's ship getting destroyed by one shot, it instead has a shield which gets steadily depleted when hit.
From the back of the box:
Featuring Full screen horizontal, 4 level parallax scrolling. Arcade running speed (50 frames/sec) on Amiga and Atari ST. 48 colours on screen at once. Up to 80 aliens attacking simultaneously. Full screen animation sequences totalling over 450 screens. 4 channel sampled soundtrack. Saveable top 50, Hi-Score table.
Fast, Frantic, Furious Gameplay