When comparing WASM-4 vs Moai, the Slant community recommends Moai for most people. In the question“What are the best 2D Lua game engines?” Moai is ranked 8th while WASM-4 is ranked 12th. The most important reason people chose Moai is:
The Moai SDK Forum is active and users will go to great extents to answer queries, post code snippets, beta test, and even purchase and give feedback on each others' games.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Runs anywhere
Besides desktop/mobile web support, it even runs on low-powered microcontrollers.
Pro Multiplayer
Simple multiplayer option without installation, account creation or configuration.
Pro Helpful community
The Moai SDK Forum is active and users will go to great extents to answer queries, post code snippets, beta test, and even purchase and give feedback on each others' games.
Pro Helpful and detailed documentation
Although the Moai SDK is very advanced and uses complicated features, the documentation wiki thoroughly and clearly explains how to use these features, such as the Moai Cloud(a service that provides web services for your game), and multiple ways to build from source.
Cons
Con Still in Alpha
Con Not for beginning developers
The Moai SDK has very advanced features which allow it to create powerful games. A drawback from this is that it is not very suitable for beginners.