Juno Nemesis is a 3D shooter in the style of Tempest and Gyruss with modern 3D graphics.

Set inside the cyberspace of a huge and powerful computer called Juno, the player must defend the machine from a virus program designed to destroy the system. Six levels or constructs must be saved by destroying 30 waves of the attacking bugs.

12 power-ups , 3 weapon types , bonus items and extra bolt-on weapons are introduced over the 30 waves until the final showdown with the Nemesis itself.