The game should be working on Linux now, I had some trouble when testing it (just showing a black screen) until I switched around some graphic settings.
It's only tested on Ubuntu 20.04, can't guarantee it will work on other distros
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Dungeon of Rikka update for 17 March 2021
Dungeon of Rikka - Now available for Linux
Wendy
Patchnotes via 
Steam Community