Games like Koronis Rift

"Ceres" is a single-player Science Fiction Role Playing game with a good plot set in a ravaged solar system where Earth has been destroyed. The solar system has been changed due to the malfunctioning of the Gate, a device built to connect Earth to other stars. Now, human factions are at war, monstrous machines and alien creatures roam, and real dangers and myths intertwine in this cold, dangerous world. However, be aware that the game is very buggy.

StarMade is a free-to-play Sci-Fi Shooter game, currently in Alpha, that offers single-player, local multi-player, and online co-op/PvP gameplay. Players can support the developers by purchasing the game, which will grant access to future updates and exclusive features such as blueprint hosting and multiple skin uploads. Despite some optimization issues and bugs, the game offers plenty of humor and grinding for space exploration and battles.

"Scavenger SV-4" is a first-person science fiction game where you explore a radioactive alien planet through a remote-controlled rover. Collect samples, research them, and enhance your rover to uncover the mysteries of the planet. Each playthrough offers a new planet and story, providing high replayability.

Space Empires: Starfury is a new installment in the long-lasting Space Empires series. No more tiny 2D graphics this time - Starfury features a first-person perspective from a lone ship and a all-new real-time 3D rendering engine. As captain of your battle cruiser, you'll travel through solar systems via warp points, explore the galaxy, engage in furious space combat, and join in large fleet opera…

"Shortest Trip to Earth" is a roguelike spaceship simulator where you navigate through a procedurally generated universe. Manage your crew, ship systems, and resources while encountering various alien species and events. Your goal is to reach Earth, but with permadeath and randomly generated challenges, each playthrough is a unique journey.

"Duskers is a single-player Horror Strategy game with a good story, exceptional gameplay, and dense atmosphere. As a drone operator, you explore derelict spaceships using only remote microphones, motion sensors, and a command line interface to survive and uncover the universe's fate. Scavenge for upgrades, evade dangerous creatures, and adapt to broken equipment to piece together how the universe became a graveyard."

"Weird Worlds: Return to Infinite Space" is a sci-fi, roguelike strategy game that takes you on randomly generated space adventures. Explore, battle, and survive in a procedurally generated galaxy filled with strange planets, alien species, and dangerous space creatures. Every playthrough is unique, offering a fresh and unpredictable experience with each journey. Make quick decisions as you manage your resources and navigate the unknown depths of outer space.

Genesis Alpha One is a first-person shooter and base-building game set in space. Players must build and upgrade their spaceship, recruit crew members, and fight off alien threats while searching for a new home for humanity. The game also includes survival and roguelike elements, with procedurally generated levels and permadeath.

"StarDrive is a single-player Science Fiction Real Time Strategy game with high-quality graphics, offering a sandbox experience for players to build and design peticular spaceships for tactical combat and exploration. However, the game is criticized for its lack of optimization and numerous bugs, as well as the requirement of grinding. The game boasts a modular approach to ship design and a real-time gameplay with a seamless zoom feature."

Road to Eden is a third-person cooperative survival game set in a post-apocalyptic world overrun by alien forces. With no memory of your past, you must join other survivors on the dangerous journey to Project Eden, the last hope for humanity. Crafting in the game is recipe-based, with players learning new recipes by finding books and broken objects, and gaining experience to level up their characters. The game can be played as a single player or on official/player-created servers.