Took a bit time to tidy up the code and write a bit of documentation, but here is the result: https://github.com/skhoroshavin/pixel-tools Please let me know whether this looks clean enough for average user, or whether you have any concerns/wishes regarding root readme. Also, if you have a Windows PC I would be very grateful if you could test windows build (I have only Mac M1 at home)
UPD Also created an itch.io page: https://skhoroshavin.itch.io/pixel-tools