Hello. First I thank you for the interest you show to the project. A Linux Version was indeed requested, so it would be nice if I managed to pull it out. But I tend to focus first on prototypes/demos for Windows for the larger audience, so sorry if there might be an oversight.
There are plans to put it on Steam, but unless it's ready to the point of being a Demo, most of the content will first stay on itch.io. But yeah, it being on Steam has a lot of advantages for me and for players.
The full rpg experience is a big project and will take a lot of steps to be a full fledged game, so please carry on for the wait.