Love it! My only critique is that the initial hammer swinging minigame is timing based and takes quite a while, meaning you can only ever make a maximum of 3-4 scales per round. I would also love to see more longer timers per round, as an option at least. Ooh ooh! Or better yet an endless mode where you go until you make a wonky scale!
Anyway, fun, well-explained, very creative, charming style, and it works perfectly! Feels like a main mechanic in a medieval-fantasy farm sim :)