Most importantly the documentation and example code are now so robust that most common game components like 2d physics, collision, projectiles, multiplayer can be found here: https://www.phaser.io/examples
The jam was "genre shift", where participants were supposed to take an existing game and shift it to another genre. I chose the Atari 2600 classic Air Sea Battle and turned it into a simple golfing game.
I liked the idea of using the 2600 as a starting point so I could worry less about the graphics and more about the physics and gameplay.
It's simple but it works. It's almost much more fun on a phone - the touch screen is more fun than a mouse for this one. :)
Anyway, it's a good framework but you have to pick a version and there isn't an obvious answer.
I hope this year I'll have some time to participate!
On a somewhat related note, the games from DigiPen's senior projects are often pretty enjoyable: https://games.digipen.edu/. I'd especially recommend Narbacular Drop (predecessor of Portal, the game got the students hired at Valve), and Empyreal Nocturne (a sort of aerial combat game).
From the knowledge I gained in this, I was able to make a simple infinite scrolling game, package it up with cocoon and release it into the iOS and Android stores all within a day from my bed on a Sunday. It wasn't the best game ever but amazing to be able to get something out there so fast (I am a JS dev)
I've not done any game dev since but may use this jam as an excuse to take a stab at Phaser 3
- 2017: https://blog.github.com/2017-12-22-game-off-2017-winners/
- 2016: https://blog.github.com/2016-12-13-game-off-iv-highlights/
- 2015: https://blog.github.com/2015-04-21-game-off-iii-everyone-s-a...
- 2013: https://blog.github.com/2013-10-30-github-game-off-ii/