Thank you so much ! Your advice is so detailed and useful, I'm glad I can play this game thanks to you ! If anyone else facing the same issue is cautious about using a download link directly from someone, you can find it here https://nwjs.io/ it'll be the new version of the program but it works exactly the same. Also for some reason clicking or double-clicking nw didn't execute it like in the gif (also I had permitted execution), if it does the same to someone else, just use the terminal to launch it.