Two short plays of Don Ursem's Starbase Hyperion, released for Atari 800 in 1981.
Initially developed and published for the Exidy Sorcerer home computer in 1980, Ursem ported his game to the Atari 8-bit.
Playing as the colonial side, you must successfully defend Starbase Hyperion for a total of 15 days (turns) or destroy all incoming enemy forces to win. The starbase is located in the center of a 360-degree field. During each turn, you manage the limited resources that control your power generators, shields, and ability to build and power ships and probes. A fleet, derived from five different classes, can be created and commanded, the amount of energy used determines the ship's combat strength.
There are a total of 6 difficulty levels, affecting the strength of alien vessels from small fighter squadrons to dreadnaughts.