Games like Kerbal Space Program

"Cities: Skylines - Starter Deluxe Edition" offers a comprehensive city-building experience, including five historical monuments, an original soundtrack, and a digital art book. The "Industries Expansion" deepens the gameplay by providing advanced tools for industry development. This package provides everything you need to create a thriving metropolis.

Universe Sandbox is a physics-based space simulator that allows players to create, destroy, and interact on an unparalleled scale. Experience realistic gravitational pull, collisions, and stellar phenomena as you build and manage your own universe. With accurate models of known celestial bodies and the ability to create your own, this game offers a sandbox for both education and entertainment.

Space Engineers is a sandbox game set in space, where players build, design, and maintain various types of space vessels and stations. It features both creative and survival modes, allowing players to either freely build and explore or survive in a hostile environment. The game also includes physics-based engineering and destruction, adding a layer of realism and challenge to space engineering.

Stormworks: Build and Rescue is a physics-based game that allows players to design, build, and pilot their own sea-rescue vehicles. Players must use their problem-solving skills to complete missions and rescue citizens in various challenging scenarios. The game also features a sandbox mode for open-ended creative play.

Spaceflight Simulator offers a realistic, open-world exploration of space where players can design, build, and pilot their own spacecraft. With accurate orbital mechanics and physics, the game challenges players to navigate through the solar system, landing on various planets and moons. The game also features a sandbox mode for creative and unlimited space exploration.

Scrap Mechanic is a multiplayer survival sandbox game that lets you build and create using powerful tools. Crash-landed on a strange planet, you must defend against hostile Farmbots and engineer your own adventures. Regular updates bring new content and optimizations to this imaginative, robot-filled world.

"Besiege" is a physics-based medieval siege warfare simulation game. Construct and control trebuchets, ballistas, and other war machines to destroy fortresses, conquer kingdoms, and complete various objectives. With a range of materials and design options, players can build and test their engineering skills in this creative and destructive sandbox.

Spaceflight Simulator is a single-player simulation game with perfect mechanics that make rocket science simple yet engaging. Featuring amazing graphics, a dense atmosphere, and a sensational soundtrack, it delivers an intriguing story filled with humor and emotional moments. Though it can be very grinding and has lots of bugs, its immersive experience keeps players captivated.

"SimplePlanes" is a sandbox-style construction simulation game that allows players to build and fly their own aircraft. With realistic physics and an intuitive building system, players can design planes that range from simple gliders to complex military jets. The game also features a variety of challenges and missions to complete, as well as online sharing capabilities for custom-built planes.

"Give Me Basic " is a budget-friendly game that offers a sandbox experience similar to "Astroneer." Players can explore, gather resources, and build structures in a procedurally generated world, but may find that the game lacks some of the realism and polish of its inspiration. The game's Early Pack edition includes access to early updates and additional content. Follow the installation instructions provided in the game's YouTube video to get started.