Awesome. There is a very surreal joy in building such standalone tools even just for learning. I have been working on a kitchen sync style "chat" app to experiment with new ideas (like integration with X/y/z). I just need to muster the courage to publish it!
100% agree. I've been "reinventing the wheel" (my own terminal color library, CLI framework, GNU Stow alternative, etc) and loving it! I get a lot of satisfaction from using these simple tools [0].
I say publish your work. Chances are, no one will care and you have a nice backup of your code. And if someone does find it useful, then great!