(Just realised that I should be running the "nw" file and not the "game", my bad. Prehaps consider a rename to avoid confusion? not sure if this error presists if I run nw instead of game)
The game is developed on and for windows. RPG Maker MV has options to export to mac and linux as well, which is why this game exists on these platforms. Unfortunately I don't know anything about linux or mac development and therefore don't want to mess with any of the files, in case it breaks the game further. If the game is unplayable on linux, I'm afraid I'll have to take that build down, so please let me know. Sorry for the inconvenience :(