Games like Millikan's Reach

"Silent Sector" is a submarine simulator set in a futuristic, dystopian world. As a captain of a high-tech submarine, you must navigate treacherous waters, manage resources, and complete missions while avoiding detection from advanced enemy forces. The game offers a mix of action, strategy, and stealth, with a focus on realism and tactical decision-making.

SpaceBourne is a single-player Role Playing game with an intriguing story and fabulous gameplay, set in a vast universe with over 100 Solar Systems, 400 planets, and 37 space stations. Players have the freedom to mine, salvage, hunt, explore, trade, and engage in various activities with the goal of acquiring and customizing ships and weapons. Despite some bugs, the game offers an immersive experience with its impressive visuals and amazing soundtrack.

In "Star Nomad 2," a sandbox space game, players can engage in various professions such as trading, bounty hunting, piracy, and mining. Your actions have consequences that affect the game's living universe and its factions. The game features real-time combat, skill-based progression, and a deep trade system with dynamic supply and demand. Customize your ship with upgrades, modules, and resources found during gameplay. Decide the fate of humanity in this immersive and evolving universe.

"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.

"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.

Everspace 2 is a single-player space exploration and combat game with RPG elements. Traverse a vast open universe, gather resources, upgrade your ship, and engage in high-stakes dogfights against hostile alien forces. Experience a compelling story with diverse characters, factions, and quests. The game features stunning visuals, detailed space environments, and immersive sound effects.

Space Impossible is a real-time strategy game set in space where you manage a fleet of ships and bases. Expand your territory, gather resources, and engage in strategic battles to secure your dominance. With various ship types, upgrades, and customization options, adapt your strategy to overcome a range of challenges in this immersive space opera.

Rebel Galaxy is a space combat simulation game set in a procedurally generated open world. Take control of a starship and explore the universe, completing missions, trading goods, and engaging in thrilling battles. Customize your ship, recruit crew members, and upgrade your arsenal as you uncover the mysteries of the galaxy and forge your own path as a rebel leader.

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.

Drox Operative is a space-themed action RPG where you are the captain of a spaceship. Your mission is to explore, trade, and complete quests while navigating a dynamic galaxy filled with various alien races. As you progress, you can upgrade your ship, hire crew members, and negotiate or battle with other spaceship captains to gain fame and power. Your actions can shape the galaxy's political landscape, leading to different endings.