Google launched in-app purchasing system today, and UE3 Mobile today releases a free-to-play version of Dungeon Defenders: First Wave on the Android Market Place. This version will allow users to buy pets, armor, equipment, and a host of other in-game items via in-app purchasing.
Here's a video of it running awesomely on the iPad 2 which shows off the iPad 2's true power. The game in the video is running at max graphics settings (which can be selected by users in the main menu). If you turn it up this high in the tavern on an iPad 1 you can hardly move around. And to celebrate the game is on sale for $0.99.