I really liked Chrome's lightsaber experiment and jackbox.tv, decided I wanted to try something similar with multiple inputs.
What it does
Two players enter, lots of balls spawn. Tap/click the screen to pull the ball towards the cursor, but keep an eye on your click power (the green bar), it recharges slowly! First to five points wins.
How I built it
By the grace of caffeine and the generosity of HackRice. But seriously, I used Phaser.io as a basic game engine, and made a duplicate p2.js physics engine running serverside in Node to sync game physics between players (could largely prevent cheating etc.), and information is passed back and forth using socket.io on each side for lightweight structured communication.
Challenges I ran into
Decoupling the prototype's physics from Phaser.io's internal engine was...problematic. Serving simple files with Node is way harder than I thought.
Accomplishments that I'm proud of
That it works at all! Seeing two devices in sync in realtime and knowing I built it all in 36 hours is a GREAT feeling
What I learned
The value of writing "bad" code to be "lifted up" into abstractions later, instead of trying to get all the abstractions right from the get-go. Cheers to an IRC friend for sending me some language design lectures that got me thinking along this line. I will write more "bad" code in the future if it leads to projects that work like this and are this much fun!