It must be due to an incompatibility between the version of Ren'Py which RandomGuy used and the one with which the game was built (7.4.8). Being on a Mac, I sometimes use the latest version of Ren'Py to run games which have no Mac version (or whose Mac version is behind the Windows/Linux version), some work well, some don't. I just tried with "Mythos", it creates an error at start with Ren'Py 8.0.2.Does this happen if you run the .exe included in the zip file? I'd heard of people who have this issue running it via Ren'Py (which I didn't even know was something you could do), but running it as a standalone may work better.