I started up the linux version and I got a black screen. The custom cursor and the music loaded ok but no picture. my machine is running linux mint xfce 18.3 and I am running the current version of the game

Hey, sorry about that! It seems to be a problem with Unity itself as another Linux user also reported the problem and even offered a solution that he had found on other Unity games. The problem is that it launches as full-screen and some strange issues occur during the splash screen that causes that. Launch with the following argument and it will solve your issue until we find a more permanent solution.

-screen-fullscreen 0