When I first read about Toy Rush I wasn't too excited. But then I started digging in more and got considerably more excited. It just might be the game I've always wanted. We've had tower defense, and even tower offense, but not a great turn-based multiplayer tower defense.
While the developers may not describe it this way, I see Toy Rush as a turn-based two player Tower Defense game. The basics are that the player creates towers and creeps; creating a home land inhabited by developed and upgraded towers while sending created creeps to battle other lands.
In Toy Rush, I get a real Clash of Clans vibe to the multiplayer. Likely not a mistake. It's proven to work well. The game should be out shortly from Uber Entertainment - take a look at the teaser trailer below and a screenshot of the game in action.