I finally made it! I managed to publish my first program :D
It's called "Harmonies". A program to explore harmonic story-telling in music. You can find it on itch.io for pay-what-you-want 0:)
You can either write notes and chords and analyze which scales/harmonies are defined by them, or you can select the scales you want to tell your story in and see which notes are allowed.
I hope you have as much fun using it as I do!
Cheers, Felix