So... I wrote to 11 bit studios and got a reply back today:
"Thanks for getting in touch with us. As of this moment, there are no plans to release Moonlighter for Linux on GOG, sorry. :("
Well... dear GNU/Linux enthusiasts, if you want the native version, purchase the game from Steam or HumbleStore.
I do have to wonder why it's not possible to just add that platform here, but there was no explanation.
Post edited September 25, 2018 by Ryol24