Games like Project 5: Sightseer

Planet Nomads is a sci-fi sandbox game that allows you to build and manipulate structures in a procedurally generated alien world. Survive by gathering resources, crafting tools, and creating technology to protect yourself from the planet's dangerous wildlife. Experience a blend of survival, engineering, and exploration as you navigate through different biomes and uncover the mysteries of the planet.

"Osiris: New Dawn" is a sci-fi survival game where players explore and colonize alien planets. Gather resources, build bases, and advanced technology to survive against the harsh environment and alien creatures. Fight solo or with friends in online multiplayer mode to expand your territory and uncover the mysteries of the galaxy.

Planet Explorers is an open-world sandbox adventure game set on a distant planet. Players can build and customize their own tools, vehicles, and structures, while also gathering resources, completing missions, and fighting alien creatures. The game features a dynamic story generation system, allowing for a unique experience with each playthrough.

Eden Star is a sci-fi survival game set on a mysterious alien planet. Gather resources, build structures, and defend against hostile creatures to ensure your survival. Use intuitive crafting and physics-based mechanics to manipulate the environment and create advanced technology for your survival. Explore, gather, build, and conquer in this immersive and beautiful world.

Interstellar Rift is a sandbox-style RPG set in the vastness of space. Players can explore, trade, and build their own spaceships as they navigate an open world filled with procedurally generated galaxies and alien races. Collaborative gameplay is encouraged, with the option for players to form factions, engage in piracy, or work together on massive capital ships. The ship-building aspect is highly detailed, allowing for customization of every aspect from engine to weaponry.

Explore and exploit distant worlds in a game of aerospace industry and interplanetary exploration. With your gun you can reshape the landscape around you and gather resources. On your journey you come across special artifacts that will provide you with research points, in order to unlock new technologies. These include rovers and spaceships, in order the expand your reach on the planets in the sol…

CryoFall is a sci-fi open world colony simulation game where players can choose to play in PvE or PvP mode. The game features massively multiplayer options, including co-op and single-player, with good game mechanics and awesome graphics. Starting with primitive technology, players must progress towards modern industrial and space-age technology while building bases, farming, and exploring.

In "Outpost Zero," players lead a team of robotic assistants to build, automate, and defend a base on the alien planet of Gaiya. The goal is to prepare for future human colonists seeking to escape Earth, all while competing with other corporations for profit and survival. Players must balance resource management, base defense, and combat against alien creatures and pirate raiders to succeed .

Empyrion: Galactic Survival is a space survival adventure game that lets players build and pilot their own space ships and stations. Explore, mine, and fight across procedurally generated planets and alien structures in a vast, open universe. Experience a mix of sandbox construction, survival, and combat gameplay, with a heavy emphasis on player freedom and creativity.

"Starbase" is a science fiction open-world game in early access that combines single-player, co-op, and massively multiplayer options with a focus on building, designing, and battling in space. Its destructible environment and hybrid voxel/vertex mechanics allow for detailed simulations and creativity, but expect some bugs and grinding. The game includes impressive graphics, exceptional music, and a full roadmap of upcoming features.