Obfuscator (minifier) ​​of Lua code with support for global variables and table indexes?

Question

Code Obfuscation

There is only this code minifier:
https://mothereff.in/lua-minifier
It works well, replaces all local variables with a, b, c etc. But you cannot specify a list of global variable names and array keys that would also be replaced.
For example, I have a table PLAYER = { health = 100, score = 0 }. It is not used anywhere outside of the script. So why not replace it with a = { b = 100, c = 0 } and all calls accordingly? This can be set in a separate list, where the user himself would indicate all the names that need to be shortened.