
http://www.atlus.com/rockofages/
This is looking like a VERY VERY VERY fun game.
I have no idea what genre it is, one of the developers commented:
Carlos Bordeu said:I don't know... marble game meets tower defense?
That will do for me

It is being developed by Ace Team, the crazy guys who developed Zeno Clash so expect the unexpected.
Released 2011.
Rock of Ages: Powerups Trailer
Rock of Ages: Rock Beats Everything Trailer
About the Game
A rock-solid combination of rock-rolling action, deep strategy, and captivating art and music from different ages of history, this is a game of crush or be crushed! Two castles stand opposed; one is yours, the other is your enemy’s. They're a jerk and their castle sucks, so you’re going to try to smash it using an enormous boulder. Even as they build up their defenses, you're ready to roll over them in order to raze that unsightly tower. But beware! There’s a giant boulder headed your way, too.
Key Features
Brought to you by the insanely creative minds of ACE Team, makers of Zeno Clash!
Take control of a giant boulder and crush your enemies!
Use an amazing variety of units to defend your tower and knock your enemy off course.
Bring your fight to both online and offline multiplayer!
3 different modes: War, Time Trial, and SkeeBoulder.
5 rich, historic periods of art and music create a gaming atmosphere unlike any other.
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