I have been working for the game "Bingo Battle" as an art director since 2013, my main job has been to create the environments, character design, some game mechanics, game-play concepts and ideas, but mostly my job was about the creation of the core visuals.
I created lots of designs for the UI but they were changed or adapted later on by the design team.
Since the game is live (and free) you can see how it all plays together at these links (mobile version on google play is highly recommended):
https://play.google.com/store/apps/details?id=com.reels.bingobattleandroid&hl=en_US
Or you can play a desktop version here:
www.bingobattlegame.com
https://www.facebook.com/bingobattle/