I've used both Unity and MOAI. Unity is too heavy for a cross-platform 2D game engine - whereas MOAI is absolutely light and tasty. No question, there is big

I've used both Unity and MOAI. Unity is too heavy for a cross-platform 2D game engine - whereas MOAI is absolutely light and tasty. No question, there is big power in the Unity tools. But if you want to build a 2D game with physics and access to cloud services, MOAI does a pretty damn fine job of giving you exactly what you need, and getting out of the way. Plus, you don't have to buy a per-seat license for MOAI...