Games like R'lyeh

"The Solus Project" is a first-person survival game set on a mysterious and uninhabited alien planet. As a lone astronaut, players must navigate the harsh environment, gather resources, and uncover the secrets of the planet in order to survive and ultimately find a way back home. With a focus on exploration, problem-solving, and atmospheric storytelling, players will experience a sense of isolation and desperation in their quest for survival.

"Signs of Life" is a sci-fi first-person adventure game that allows players to explore an abandoned space station and discover the fate of its lost crew. Utilize survival and puzzle-solving skills to delve into the mystery, while combating alien creatures and repairing systems necessary for progress. The game features unique environmental storytelling, immersive atmosphere, and an emphasis on exploration and discovery.

"Arctico is an open-world, 2-player co-op game featuring base building, exploration, and collection of resources. Customize your base and equipment, and take care of plants and experiments to upgrade. Discover the island's locations and secrets, and enjoy the exceptional atmosphere, music, and visuals, but be prepared for bugs and grinding."

Ambrosia Sky: Act One is a first-person immersive sim set in a forsaken colony overrun by hostile alien fungi with unique abilities. Players navigate treacherous zero-G anomalies, harvest fungal fruit to craft chemical agents, and explore eerie ruins to uncover a dark mystery. The game offers a somber, atmospheric experience blending survival, exploration, and storytelling.

"Nightingale" is a PVE open-world survival crafting Role Playing Game that can be played offline or with up to 2 players in co-op mode. The game features excellent gameplay, awesome visuals, and a wholesome story set in a variety of mystical and dangerous realms, where players must build, craft, fight, and explore to become skilled Realmwalkers and find their way to the magical city of Nightingale. Despite some bugs and grinding, the game is very atmospheric and offers ingenious replayability.

"Forever Skies" is a first-person survival adventure game set in a post-apocalyptic world transformed by a mysterious cataclysm. Players explore the ruins of Earth from floating habitats, scavenging for resources, crafting equipment, and uncovering the secrets of the planet's past. Navigate the shattered skies and confront the challenges of survival in this desolate world.

"Death Trash" is a post-apocalyptic role-playing game for 2 players in co-op mode, featuring a handcrafted world and a focus on player freedom. The Early Access version includes most features, but the story campaign is unfinished and bugs may be present. Frequent updates and a final release are planned for 2022. Players can provide feedback using the in-game tool or via email.

"Take On Mars" is a thrilling space exploration game that lets you experience the challenges of Mars exploration without the years of training or budget constraints. Operate rovers, conduct scientific research, and pioneer the colonization of Mars in a realistic yet accessible setting. The game features a space program campaign, robotics campaign, and a variety of sandbox maps to explore, all with the goal of advancing human knowledge and setting foot on Mars.

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.

Hidden Deep is a 2D sci-fi thriller game set in a sub oceanic mining and research facility, where you lead a team to discover what happened to the previous researchers who went missing. Utilize specialized equipment, give orders to your team, and defend against horrific alien life forms and other unknown dangers. The game features multiple game modes, including a single-player option.