Players pilot one of four custom ships, with a variety of power-ups and special weapons at their disposal, such as laser beam, fireball, shield, and the ever-popular split ship. Three difficulty levels are included.
Insectoid is free to try. It costs US$19.95 and requires Mac OS X version 10.4, a 1.2GHz Intel or PowerPC processor (1.8GHz recommended), and 160MB of free RAM.