We created the iOS version of DTTWZ with SpriteBuilder which is their Scene Editor + Cocos2D + Objective-C. We then used their Android plugin to compile the iOS project (Objective-C code and all) into an Android APK file. A pretty smooth experience overall, and it didn't take as long as we initially thought. There were a few issues, but we think we worked around them (knock on wood).
If you have a SpriteBuilder or even a Cocos2D (Objective-C) project, we'd recommend checking out their Android plugin. There's a free version to get the game running and paid tiers whose main benefit is an Object-C-to-Java bridge (to call Java code from Objective-C).
P.S. Despite today's date, we really did port the game!
*** UPDATE 6/25/2015: Apportable dropped support for SpriteBuilder and their Android plugin. So we can no longer recommend them for bringing iOS games to Android. It was fun while it lasted. But don't worry, we'll keep supporting Zero on Android. We'll report how pretty soon.