Games like Flatspace IIk

"X: Beyond the Frontier" is a space simulation game that allows players to explore the universe, trade goods, and complete missions. As a pilot in a massive open world, you'll encounter various alien races, manage resources, and upgrade your spacecraft while navigating the challenges of interstellar politics and warfare. Your goal is to survive and make a name for yourself among the stars.

Endless Sky is a 2D space trading and combat game inspired by the Escape Velocity series. Explore a vast galaxy filled with hundreds of star systems, planets, and alien species, while completing missions, trading goods, and upgrading your ship. With a strong focus on customization and open-ended gameplay, Endless Sky offers a rich and immersive space exploration experience. The game is free, open-source, and available on multiple platforms.

"Star Valor" is a single-player, open-world space simulator where players can explore the galaxy, engage in space combat, and manage their own spaceship. With various ships, weapons, and equipment to choose from, players can customize their gameplay experience while completing missions and uncovering the game's storyline. The game also features a dynamic economy, AI-controlled factions, and procedural generation of planets and systems for a unique experience each time.

"Void Destroyer 2 is a open-world space sandbox game set in a desolate asteroid field, where you must survive by engaging in combat, managing tactics, and making strategic decisions. Start from humble beginnings and rise to power as a mercenary, pirate, bounty hunter, or entrepreneur, building your own trading or mining business. The game offers a wide range of freedom for players to choose their own path to domination, including the option to fight hard or negotiate your way to the top." NO INFORMATION AVailable about release date or developer/publisher.

DarkStar One is a space action adventure game that lets you explore a vast universe. As captain of the spaceship DarkStar One, you'll upgrade your ship, complete missions, and battle alien races. The game features an open-world environment with real-time combat and a dynamic market economy.

"Unending Galaxy" is a space-sim and 4X strategy game set in a vast, dynamic universe with 10 factions and 90 ships. Explore, trade, build, and fight your way to carving out your own empire or become a powerful pirate. The game includes multiple hand-crafted and procedurally generated maps with hundreds of sectors and thousands of NPCs for sandbox gameplay. Control multiple ships and switch between them at will.

"Transcendence" is a single-player Role Playing Game set in 2419, where humanity is threatened by a hyperintelligence compelling people to travel to the Galactic Core. Players must navigate through randomly generated star systems, acquiring weapons and powers to survive and uncover the secret threatening the galaxy. With stunning replayability, the game offers an open-world experience of space combat and exploration, featuring compelling music and intense battles against various alien races.

VoidExpanse is a science fiction action-RPG set in deep space, allowing players to explore procedurally-generated galaxies, engage in real-time combat, and interact with dynamic factions. The game features complex mechanics for mining, trading, and character customization, as well as a meaningful storyline and options for both single and multiplayer gameplay. Upgrade your ship, complete missions, and advance through diverse skill-trees in this open-world space adventure.

"Starpoint Gemini 2" is a single-player space action RPG that allows players to explore, battle, and trade in a vast open world. Customize your spaceship and crew, engage in tactical combat, and navigate a complex storyline set in a dynamic universe. With a sandbox-style gameplay and various side missions, this game offers a rich and immersive experience for space exploration enthusiasts.

Avorion is a sandbox space simulation game that lets you build your own space ships and explore a procedurally generated universe. Mine resources, trade goods, and engage in space combat while navigating political alliances and factions. Experience a dynamic world that evolves based on your actions and interactions with other players.