Hey there, I found the following error in that log
ERROR: IOException: Invalid handle to path "/home/simon/.config/unity3d/League of Geeks/Armello/profiles/0110000107A143B9/SavedGameState"
System.IO.FileStream..ctor
You could check the file and directory permissions to that path, and if that doesn't sort this out, I'd advise deleting that 'profiles' folder from league of geeks\Armello and then verifying your game files through steam.
Let us know how it goes!
