Hi, I found that website https://czkawka.com/ and I am wondering if this is a legit source for your tool?
Neither is your name mentioned there, nor are you mentioning this site in this github repo.
Contact data on that site is:
Email: [email protected]
phone: +92 301 1644485
Address: 1600 Grand Avenue, London, NW1 6XE, UK
Maybe I am just a bit overly paranoid, but it "smells" a little bit, the whole site does not seem to fit your style.
Also they offer a download of the GUI tool from a Wordpress upload folder, so that could be anything (did not check it.)
Is this a legit site?