NÖN is an engine you can use to make games in MoonScript. It's free, open-source, and works on Windows, Mac OS X, Linux, Android, iOS and Ouya.
You will need to have JDK 7+ installed. Then you can install NÖN as rock (LuaRocks required)
luarocks install --server=http://luarocks.org/dev non
The Wiki contains all the information you'll need to write game. You can contribute to the Wiki directly here on GitHub! Also, you can view online documentation generated right from the source code.
Use the issue tracker here on GitHub to report issues.