I Ported the MOAI engine of Broken Age fame to html/emscripten, It runs full lua along with a bunch of other libraries (libpng, freetype etc) You can see it running here (and edit the code and run in browser)
http://moaiforge.com/samples/sample-browser/player/index.htm...
Hey, we interacted a little over 2 years ago when I was talking about a hand-coded port of Love2D to the web using Moonshine. Eventually the dependencies for Love did get to the point where I could do an emscripten port. Just wanted you to know that your project and our little interaction has stuck with me.