You just need to download the macOS x64 version of nw.js, extract it into the game folder, and overwrite the existing files.
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Im afraid I have little to no technical experience so I may have made mistakes. However I have tried downloading macOS x64 of nw.js and placing it into the game folder to no success. I was at first met with "cant open application because its not supported on this Mac" which I already knew sadly. Then I attempted opening nw.js thing while it was in the game folder to then get a small window with the words NW.JS with a compass on the bottom left which told me I may have done something wrong there. So then i tried the itch.io app and tried to boot it up from there and only get another error which said "Exit code 0x1(1) for (Game.app). I did buy the game though so I still have hope to play it one day.