Space engineers

Factory ship
My factory ship where ores are smelted down and components are made.

I recently bought Space Engineers on steam when it was discounted. It’s pretty much minecraft in space the object is to build ships and spacestations. Like Minecraft it has a survival mode and creative mode. In survival mode you have to mine asteroids for minerals which you can smelt down and assemble into components needed to build things and run nuclear reactors to generate power.
It’s currently early Alpha but still fun. I like the fact you build your space ships and platforms out of blocks then fly them around. You can also enable space ships which fly through the game area which you can either salvage for parts or just take control of yourself.