Got this to work in Linux btw. Here's the little hack:
* Download and extract the Linux version of NW.js. I used nwjs-v0.80.0-linux-x64
* Copy the ./www dir and ./package.json file to the nwjs folder
* Fill in the name field for package.json ("name": "" -> "name": "anything")
* Rename www/img/system/Logo.png to logo.png
(windows is case-insensitive)
* Run ./nw
I was able to play through a few endings and saving works just fine. Enjoyed this game quite well, nice work.