I've been waiting for this game to appear in the app store but it hasn't. I've tried Topple but that game sucks to me. Can some one make Tower Bloxx a App store game? You can play that game on facebook, and other websites. Link to game: http://www.funny-games.biz/towerbloxx.html
There's always a chance that Digital Chocolate brings this game to iPhone since DC has already released two games. For now you can try the $0.99 Totem game. It's fun to play.