Thank you, that's really kind! Testers like you are exactly what a small project needs, and your feedback has already made the game better for everyone. Whenever you get further in, I'd love to hear how it went, good or bad. And if anything breaks, a save from the "save" folder next to Game.exe is always welcome.
Not a silly question at all! Yes, that's safe. Once the save folder is in the new version, start the game and check that Continue loads your save. If it does, you can uninstall and delete the old version.
To be extra safe, keep a copy of the save folder somewhere else too, like your Desktop. It's tiny, and then nothing can go wrong. ^^