greetings!
sorry about that. unity generates a log file for when the game boots up, it might shed a light on what specifically is breaking for you. if interested, could you kindly send me the contents of these logs so i can take a look? i don't use ubuntu, but a quick google search tells me they should be over in ~/.config/unity3d/osur/Tower of Kalemonvo/Player.log
you can email me there over at kalemonvo@gmail.com. the files themselves don't contain any non-game information save the path it's in and some details about graphics drivers.
sorry for the hassle!