Recently, I made a challenge to make a match 3 game under 6 hours. It turned out to be a decent hypercasual game.
The full source code is here : https://github.com/nevarman/hypercasual-match-game.
License for only source code is CC0, and for the whole Unity project is CC 4.0.
For the art assets and sound licenses please check the link on github page.