Use Enigma Virtual Box if you want it as a single exe file. More information here on NWJS wiki:
> Enigma Virtual Box is a software that 'enables application files and registry to be consolidated in a single executable file'. It's free for personal and commercial use.
https://github.com/nwjs/nw.js/wiki/how-to-package-and-distribute-your-apps#an-alternative-way-to-make-an-executable-file-in-windows
With Enigma Virtual Box, however, a double click is enough to open the game, it doesn't install the game, as happened with Install Forge, only that Install Forge with Construct no longer seems to work