For some reason, this game randomly crashes on start with the error message "Pixi.js Error: Could not initialize shader". Even if I managed to get it to start properly by just retrying, it would still crash randomly during game play. This is very annoying, and I don't know the cause.
One clue is that the game's executable name is "nw.exe" rather than the common "game.exe", suggests the author replaced the engine that came with RPGM with one from nw.js. So I tried to download a newer version from the nw.js official site and replace the files in the game folder, and it worked. The game now starts every time I run it, and I haven't come across any crashes since.