Now this snake is available on firebase at https://mqtt-snake.firebaseapp.com/. You can also control via PS4 Dualshock controller attached to the MQTT broker (e.g. Adafruit.io) via pygame. See ps4_controller.py as an example.
Updated codepen example is here
A Vue.js project (MQTT/Adafruit.io not enabled)
# install dependencies
npm install
# serve with hot reload at localhost:8080
npm run dev
# build for production with minification
npm run build
# build for production and view the bundle analyzer report
npm run build --report
For a detailed explanation on how things work, check out the guide and docs for vue-loader.