I've tried searching online for this - but I always end up in the in-game programming language (C#) sites, but I'm curious what the game itself is programmed in. I would assume a game like this would be C++, but you never know.
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The source code of the game (albeit an outdated version as stated in the README), is available on GitHub from KeenSoftwareHouse - the game developers themselves.
It appears to be primarily written in C# with a few shader files.
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