Using Linux I encounter the same issue. I'd like to be able to play it though. It loads and music plays and I can see the menu, but can't click on anything and buttons do nothing.
Unfortunately we've removed the Linux and Mac builds from the listing of the game. We had to do some strange things to make an input system support various input methods and said things do not play nice cross-platform. As most of the team has disbanded or moved onto other projects, updating this game further is not really possible any more. My sincerest apologies :(