The Corona SDK is an excellent tool that has gained a lot of ground among iOS developers, especially those developing iOS games.
One of the most powerful features of the Corona SDK is that it is integrated with the Box2D physics engine, and has a large set of simple wrapper methods for those looking to integrate physics into their games. I found an interesting tutorial where you create a top down classic arcade airplane that actually utilizes the physics engine.
The tutorial is from Karnak games and can be found here:
How To Make A Simple Physics Based Shooter Game With The Corona SDK
This makes for a good tutorial if you are looking to get started with the box 2d capabilities of the Corona SDK.
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