KOI - Journey of Purity By: dawei lee KOI - Journey of Purity is one of those games I saw in the App Store and bought on whim, based on the description and video. I had just recently played Prune and had an itch for another artsy and tranquil puzzle game. But while KOI is most definitively a pretty game, it's by no means tranquil. The game has you controlling a small…