Chat application in Node.js using Socket.io

Hello, this was my first ‘serious’ project in Node.js. I created a simple chat appliaction with Socket.io. I don’t know how I’m supposed to share my code here so I will paste link to my project’s github repo:
https://github.com/bartekw2213/MessageMe
Also I deployed this site on Heroku:
https://obscure-dusk-78717.herokuapp.com/

What do you think about it guys, what should I change? Is it good enough to put it in my portfolio? Thank you for all of yours responses.