Sadly seams freeze on Ubuntu 20 while loading, only shows a blue screen, outputs nothing to the console, and outputs nothing to the log other than what I always see in unity games. The splash screen however does show, hope this gets fixed and looking forward to you're next video.
Having the same issue here on Manjaro Linux. This issue existed in version 0.3.0 as well, but it showed a grey screen instead. Someone suggested that the issue was an improperly positioned camera in Unity, but I’m not entirely sure. The developer said he was going to take a look at it back then though. So hopefully this will be fixed soon.