So, I tested your game once more. First I decided to give the Windows-version one more chance and allowed my Virtual Machine with Windows to have more memory. It started, but it flicked like crazy. Thankfully I'm not epileptic. After some time of masochistic gameplay even more visual glitches appeared, for example sprites of characters were replaced by black boxes.
Then I tried your Linux version. Everything seemed to work (including save/load function), there were no glitches, etc. But then, out of sudden the game froze my computer and I was forced to use hard reset. I was expecting that the game will freeze at some point (it's typical for RPG Maker MV games), but I was surprised when it froze my whole computer.
P.S. By the way, I don't understand why you can't test your game under Linux.
Unlike Mac version it doesn't requre any special hardware (although Linux can work on Macbooks too). You just need to install Linux as your second OS. There are some very novice-friendly distributives of Linux, like Ubuntu and Linux Mint.
P.P.S. Please add "RPG Maker MV" tag to show that you use RPG Maker MV as your engine.