Link Shell Extension has a very similar clone feature. I recommend using it as it is more integrated into the File Explorer and has visual distinctions for the folders and files it makes. It's also a more mature product, which this project could've been, but seeing as it's effectively the same but better, I might switch this now-dead project to a GUI manager and launcher of apps and folders that are cloned this way.
Folder Cloner for Windows In Python 3.11+
Clone big folders without the doubling the space they take on your drives! Uses Hard Links provided by the Windows CMD command mklink with the /h switch.
I personally made this to use it with big games when I want to modify them for singleplayer/ always-offline use to isolate the modded game from the online game, without having to fill my poor HDD.
Enjoy!
Please note that this script is not guaranteed to work and may CAUSE DAMAGE or LOSS OF DATA. It's still in its proof-of-concept stage. Not that it'll come with a warranty or anything when I finish working on it.