Haven't decided a serious game to try since beating BL2, but been playing around with Shatter. Got it in the last Humble Bundle. Just a brick breaking game, but looks and sounds pretty. And its unique twist is you can suck and blow haha. Gives you some slight control and makes picking up the last brick a lot easier. Game has been too forgiving so far and no challenge (besides a circular shaped level or two) but still fun. There's even a few bosses.