We're in the final stretch! Try it out here if you want. Using Unity 2017.1. Load the scene "Gameplay".  https://bitbucket.org/TannerJ42/one-game-mechanic-jam-2

Our take on the theme was to add one mechanic to an existing genre - in this case, adding 'tap a block to change its color' to match 3.

Sounds cool! I'm not at a computer with unity installed, will you be submitting a compiled game to the jam? I definitely want to play your game! 

Yeah, we'll post an html5 version eventually. Maybe soon!

Here's our beta. https://poqa-tj.itch.io/omgj2-beta