Hi G-9Games, i know that nw.js uses Chrome under windows or chronium under linux to start app. You should have fixed these few errors by following the commands below
To update your actual pkg:
sudo apt-update && apt-upgrade
To installing chronium-browser:
sudo apt install -y -o 'apt::install-recommends=true' chromium-browser
Run one time:
You can close the browser and go in game path start the game with:
Let me know if errors are fix.