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Same here, makes the options useless. The bug reporter bugged out as well. I've only played a couple minutes before I gave up, but considering the issues and lack of polish I hope that this is somehow an early version, pre-alpha as it says somewhere, and not the one that's going to release in less than two weeks.

I finally figured this out and for me the answer was simple. Go to ~/.config/unity3d/ and rename voxGames to VoxGames. I don't know what happened but I know that directories are case sensitive in Ubuntu.

Good catch!
File and directory names are case sensitive on Linux in general, so if this helped it's a simple typo that the dev didn't notice on Windows (because that's not case sensitive for the most part).