For the sake of TASing, I've been getting into the process of porting Unity games to Linux when a Linux build is not officially available. This is required as the tool I most commonly use for PC TASing, libTAS, expects native Linux executables.
I won't post the whole process, but I'll explain the basics and stuff i've seen and ran into. For a full how-to, check this guide I'm maintaining for TASVideos: https://tasvideos.org/HomePages/ikuyo/Unity