> Lua is small enough that newbie developers can understand its internals well and keep it in their mind.

This is, by far, Lua's best "feature". If you know programming you can learn 90% of Lua in 15 minutes (metatables and the C stack interface takes more time).

For a language meant to be used by non-programmers this is more than precious, it is essential.

Edit: my favourite Lua-enabled tools:

1) Hammerspoon, an automation tool for OS-X (like Windows' AutoHotkey) https://www.hammerspoon.org/

2) Openresty, Nginx turbo-charged in Lua: https://openresty.org/en/

3) Wireshark, a powerful network traffic analyzer: https://www.wireshark.org/

Many others at: https://github.com/LewisJEllis/awesome-lua

PS: on Windows I highly recommend the ZeroBrane Studio IDE. It is really fantastic.