Edit1: Wait hold on I need to pack it as a zip instead of rar, you can try the following after if it doesn't work.
Edit 2: Okay now that it's a zip it should open properly and if it still won't run you can try following below. Hopefully the game is worth the like 8 months it took for me to compress it as a zip instead of a rar. smh
Alright, let me know if this works.
extract the file to wherever you want the game
go into /Levania [MacOS]/game.app/Contents/MacOS/NWJS
Open up MacOS console and type this; ' chmod +x ' (without the apostrophes) and then drag and drop the nwjs file to the terminal window to get the right location of the file and then run it.
And then try running the nwjs file.
If it works, let me know and I'll update the instructions on how to run it on the game page.
Alternatively, I believe there are free programs that will run RPG maker games for MacOS, like this https://github.com/m5kro/RPG-Maker-MacOS-Launcher/blob/main/main.p



