This is a cool project, but sadly it's not a complete Lua. It's missing two of Lua's most powerful features:

A lot of the metatable functionality just won't work: http://www.lua.org/manual/5.1/manual.html#2.8

Second, it's missing co-routines. Which is a way to suspend the execution of a piece of code.

These features aren't possible in a compiler that simply translates from Lua to JS because JS doesn't have the ability to reproduce these concepts in its own constructs. You would have to output significantly different code to simulate these features.

Without these you're just writing JavaScript in another dialect.