Games like Daiva Story 6: Imperial of Nirsartia

A sci-fi action-strategy game released in Japan in 1986 for the NES, developed by T&E Soft and published by Toshiba EMI. It's part 6 of a long-running series, though the only one to be released on the NES.

"Helium Rain" is a single-player space simulation game that allows you to manage and expand your own space corporation. You'll explore, trade, and battle your way through a vast, procedurally generated universe, with real-time physics and advanced AI. Your choices will shape the fate of your company and the political landscape of the galaxy.

"Ground Control II: Operation Exodus" is a science fiction real-time strategy game set in 2741, where the Terran Empire is at war with the freedom-loving NSA. After losing the space battle, the NSA retreats to its last stronghold. The game features single-player, multi-player, co-op options, with a good story and phenomenal graphics, players must lead the NSA to victory in this intense battle for survival.

"Warhammer 40,000: Dawn of War" is a science fiction real-time strategy game set in the 41st millennium. Players can engage in both single-player and multiplayer modes, commanding one of four races: Space Marines, Imperial Guard, Chaos Space Marines, Orks, or Eldar. The game offers an immersive experience with intense warfare, strategic military planning, and customizable army units for the complete extermination of opponents.

Supreme Commander is a real-time strategy game set in a futuristic world. Players command one of three factions, each with unique units, structures, and abilities, in large-scale battles involving land, air, and sea units. The game features a strategic zoom feature, allowing players to oversee the entire battlefield and manage resources, production, and research. Emphasis is placed on strategic planning, resource management, and large-scale combat.

"Imagine Earth is a single-player Science Fiction RTS game with a good plot and fabulous visuals. Colonize distant planets, manage resources, and deal with threats like asteroid strikes while balancing corporate profits with preserving living conditions for your people. Research technologies, build cities, and trade resources in space as you expand and maximize growth."

In "INSOMNIA: The Ark," you explore a colossal, dying space metropolis filled with intrigue, danger, and diverse inhabitants. As a "low-class" citizen, you'll need to navigate the complex politics and cultures of this isolated society, while also uncovering mysterious forces threatening the Ark. Your choices and actions will significantly impact the narrative and faction relationships in this immersive, story-rich RPG.

Geneforge is an indie fantasy RPG and the first in the five-game Geneforge Saga, known for its vast world, intricate plot, and innovative game mechanics. Create your own army of obedient creatures and use cunning enemy AI to shape your experience. With multiple endings and high replay value, Geneforge offers a rich, immersive adventure where your choices determine the outcome.

"Galaxy of Pen & Paper" is a turn-based RPG set in a sci-fi universe, where players create their own Game Master and party to explore an expansive galaxy and engage in customizable combat. This game builds on its predecessor, "Knights of Pen & Paper," with new races, skills, and campaigns, providing over 3 hours of additional gameplay in the +1 Edition. The game's setting and mechanics aim to evoke the nostalgia of pen and paper RPGs.

"Starpoint Gemini Warlords" is a space-themed, real-time strategy game with RPG elements. Players can explore, mine, and combat in a vast open world, while also managing their own space station and fleet. Building and customizing ships, as well as forming alliances, are key features in this expansive game.