itch.io

The saves are stored safely in a separate section of your computer. You are fully safe (and recommended) to delete the folder holding the current version of your game and replace it with the new version when it comes out.

I believe you are thinking of "reborn app" by thermifish

Completely unrealistic. We all know the only person Kronii would ever fuck is the Warden of Time.

Copyright is automatically applied upon the release of any perceptible tangible form of media. What you're probably talking about are trademarks. In which case, yeah, it'd probably be a good idea to register the name and logo, just in Case.