Playground Theory’s new Bonsai Slice ($3) has already gotten some press for its unique play mechanics. The game makes players move and swing their iPads around in their hands as if holding a sword. Onscreen, a swinging sword slashes through items to earn points and coins — sort of like Fruit Ninja, but with actual iPad motion, opposed to touchscreen swipes. Some parts of the game even require spinning around with your iPad in hands to slash…