Starpoint Gemini is a combination of RPG, simulation and tactical strategy. It is set in a science-fiction version of the Gemini star system, which is a former colony of Earth Empire in this game. Because of certain events that happened during a war over twenty years ago, a wormhole that was the sole entry point to the system got closed, and the system was isolated from the rest of the universe. Countless anomalies appeared inside the system, which enabled technology to advance at an astounding rate. The player assumes the role of Jared Hunt, who has been in his space ship inside a stasis rift anomaly all this time. He is rescued by a science vessel and finds the Gemini system totally different from how he remembers it to be.
There are three main factions: the Korkyran Triumvirate, the Baeldor Republic and the Nyxian Consortium. As captain of a space ship the player can freely traverse the system, making money by trading or salvaging. Several career paths can be pursued, for instance researching the anomalies, repairing ships or mining asteroids. Space is not a safe place, however, and players will have to fight rogue ships that try to steal their cargo. By upgrading his ship, or buying a new one, the player can equip weapons, thrusters and energy shields. It is also possible to enlist experienced personnel and gaining extra skills and perks like the ability to turn your ship faster, increasing the chance of a critical hit or being better at evasive maneuvers. During combat, it is extremely important to make optimal use of the relative positions of ships to avoid being outflanked or exposing your vulnerable side.
The Gemini star system is divided into 50 sectors, connected via T-Gates, and contains many space stations, mining bases, anomalies, trade convoys, pirates, asteroid fields, nebulae and other phenomena to explore and interact with. The game has a main storyline, consisting of thirty missions, numerous side missions that aren't necessary to further the main plot but help the player understand the world of Gemini, and more than 300 freelance missions for gaining money and experience. It starts with a mandatory tutorial and is played from a third person perspective. A sandbox mode is also included.