Kerbal space program is a space based game that allows the player to diffrent planets, moons, and astroids. There are 3 diffrent modes for gamplay, sandbox, science, and carrer.
You might have notised that it looks outdated but thats because it was made in 2015. A big part of KSP is the mods you can use.
There is so many mods you can download such as, volumetric clouds, parralax, firefly, and EVE (environmental visual enhancer). This game is great for space enthusests that want the experence of spaceflight.