This blogpost is old and the EC2 instance is not there anymore. I guess this was posted to give attention to the code.
I just downloaded it and am gonna see if I can get it to run...
Edit: to run the game, download the code, and open the folder in your terminal, and run:
> npm install > npm install socket.io > mv config/keys.json.example config/keys.json > node server.js
Then open your browser and navigate to http://localhost:8000