Games like Tempest Citadel

"Judgment: Apocalypse Survival Simulation" is a post-apocalyptic strategy game where players build and manage a colony in a world overrun by supernatural beings. Gather resources, research technology, and train survivors to defend against demonic invasions in this challenging survival simulation. The game features strategic base building, survival management, and thrilling battles against otherworldly foes.

"Halcyon 6: Starbase Commander" is a strategy game where you reclaim and rebuild a derelict starbase to stop an impending alien invasion. Using gathered resources, you'll build station facilities, research new technologies, establish alliances, and manage diplomatic efforts. Inspired by classic games like Star Control and Master of Orion, Halcyon 6 also features base building and exploration.

Templar Battleforce is a turn-based strategy game set in a science fiction universe. As the commander of a group of Templars, elite soldiers with powerful suits of armor, you must defend human colonies from hostile aliens. Customize your Templars' abilities, weapons, and equipment, and use strategic positioning and special abilities to overcome your enemies in tactical combat.

Warhammer 40,000: Mechanicus is a turn-based strategy game that puts you in charge of the Adeptus Mechanicus, an elite army of the Imperium, on a mission to explore a recently discovered Necron planet. The game offers a unique blend of religious and technological themes, with an emphasis on customization and strategy. The Omnissiah Edition includes bonus content such as a soundtrack, digital artbook, and a short story.

"Spaceland" is a Science Fiction Role Playing game that combines dynamic turn-based battles with rich storytelling. Create a squad of 7 space rangers, each with unique fighting styles, and explore the mysterious planet using an array of weapons and equipment. Experience sensational graphics, beautiful soundtracks, and engaging gameplay in this multiplayer or single-player adventure. The game is inspired by old-school tactics such as Incubation and Laser Squad.

Xenonauts is a single-player, turn-based strategy game set in a 1960s Earth defended against alien invasion. Players manage a military organization, completing ground missions with persistent soldiers and intercepting UFOs. With good game mechanics, graphics, and soundtrack, Xenonauts offers a wholesome and replayable experience, although some bugs and grinding may be present. Based on classic X-Com games, it aims to modernize and introduce the genre to new players.

In XCOM: Enemy Unknown, you command a secret organization, XCOM, to defend Earth from an alien invasion. You must manage resources, research alien technology, and oversee military strategies to combat the extraterrestrial threat. This updated version of the classic game offers new enemies, technologies, and a fresh invasion story, while preserving the series' strategic gameplay and base management features.

"ENDLESS™ Space 2 is a strategic space opera where you expand your empire, discover ancient artifacts, and engage in interstellar warfare. The Digital Deluxe Edition includes cosmetic bonuses, soundtrack, and access to the GAMES2GETHER community for contributing ideas and feedback. This game takes place in a galaxy originally colonized by the enrocked beings called the 'ENDLESS™'."

Zephon is a post-apocalyptic 4X strategy game built on Proxy’s unique tactical combat system. Guide survivors through a grimdark future, navigating unexpected disasters, eldritch horror and cyberpunk monstrosities. What will you do to survive?

"Settlements" is a single-player Role Playing game with a strong focus on resource management and technological advancement. Players must rebuild civilization from the Stone Age, customizing characters and training their skills while researching technology at their own pace. With 10 distinct eras to progress through, Settlements offers a rich and immersive gameplay experience, but be prepared for some grinding.