"Ronin The Samurai HD is a side-scrolling hack-and-slash video game developed by Angry Martian Studios, and published by Angry Martian Studios for the iPad.
Ronin The Samurai HD was developed using the Unity3D iPhone game engine. The iPad-only game features remastered graphics, new artwork. new animations, and new enemies compared to the iPhone version. The game was released on the iTunes App Store on May 21, 2010."
Source: Wikipedia, "Ronin The Samurai HD", available under the CC-BY-SA License.