The prototype of the game is open source. Unity Asset.
Features: infinite procedurally generated world, almost complete destructible of everything, a very large number of NPCs (up to 1000 in one star system), battles involving hundreds of NPC, gravity is an important game element.
To work on the project, you will need a Unity version of at least 2019.1.8 or higher (64-bit).
Scripting Runtime Version - .net 4.x Equivalent