Browser technology has come a long way in the past few years, allowing for impressive games. I'll guide you through building a multiplayer browser game.
Browsers also support near real-time networking, but it can be a bit of a hassle to manage. I'll show you how to use Pusher to easily add multiplayer features.
Generally you want your game to look polished, unless that's part of the theme. If you're not an ace designer, I'll guide you through creating graphics in Sketch.