Heya! Sorry to reply so late. Unfortunately there have been issues with exporting it to anything but Windows. The HTML5 build we made missed key parts for instance(We still don't know why), and the Linux build was mostly there per request of a close friend more than anything else. In the future, we'll likely focus way more on getting a HTML5 build working and having OS specific builds optional.
Being done with the project and only then finding out the HTML5 version doesn't work as intended made us stick to the Windows build as a representative version of the game. Otherwise we might have exported it to everything else aswell.
The issue was that some things were not being displayed and people would have had to guess that the game is even still running.