Gyruss

A port of Konami’s 1983 arcade shooter in which the player’s ship moves in a circular path around the screen perimeter rather than along a horizontal or vertical axis. The goal is to liberate all nine planets of the solar system from the Gyrusians, clearing three enemy waves per planet before moving on. The ship starts with a single cannon and can be upgraded to a double cannon by shooting a power-up satellite. A bonus stage follows each planet, offering additional weapons and bonus points.