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