hm... it would be greatly appreciated to have either official linux support, or at least a linux build. sure, compatibility layers exist, but they dont always work as intended, at least not without knowing them really well.
since you are on unity, the process of making a linux build is extremely simple, and i say this as a fellow game dev. please take the time to do it when releasing the full version, or earlier if possible.
We are using UniWindowController (https://github.com/kirurobo/UniWindowController) which is not supported on Linux. That being said, we added the overlay mode toggle in settings, specifically because it improves compatibility on Linux.