I've been evaluating moai for a few weeks now and I have to say that it is a bloody brilliant bit of software engineering .. not only does it run smoothly, but its just such a pleasant set of paradigms to learn to build games - no longer do I need to sort my objects or do other things for performance, the moai runtime and object model is designed from the get-go to make it easier for the engine itself to do the optimization while the programmer fills in the content pipeline. I'm very impressed personally, and will be using it for my next game projects to release on Android, Chrome, and iOS simultaneously ..