Tennis + breakout! You have a couple different swings (lob, forehand, spike) and have to destroy all the bricks without letting the ball bounce twice in a row. Perfect hits give you extra super meter, and filling the meter grants you powerful buffs (such as multiball).
I love the idea and like the design space offered by tennis + breakout, but in practice the gameplay wasn't quite what I was looking for. It's fun, but tennis in a 2D plane wasn't hitting the right notes for me.