It seems that you're using an outdated browser. Some things may not work as they should (or don't work at all).
We suggest you upgrade newer and better browser like: Chrome, Firefox, Internet Explorer or Opera

are_solars: Why only for Windows.
Are there any plans to publish it for Linux or Mac?

As a 2D-Witcher RPG, it could be a chance to bring it to Linux...
It would be awesome to see gamers play Thronebreaker on as many platforms as possible, but right now the focus is on the already announced versions for PC, PlayStation 4 and Xbox One.