Most game engines basically take lua and create their own coding variants of lua (some way more unrecognizable from pure lua than others). And there are other languages that are just conversions/variant of lua like moonscript...but even tho moonscript is a seprate 'name' it can be closer to lua than an engine listed as 'lua'. Can you clarify these cases and if they fit the jam?

I Was thinking the same thing 

Pure lua API ftw

Use lua as coding and thats all