I really liked how naturally Rhythm was woven into the game alongside Echo and Molt. The repeated sequence of movements becomes both a rhythm and an echo of Wyrm's life, and when that sequence finally breaks, it marks another major turning point in their journey.
I especially love the idea that every forgotten movement isn't simply a player making a mistake, but represents Wyrm losing something important and being forced to move forward. That's a really elegant way to connect the mechanics to the story.
Have you had the chance to playtest it yet? I'm pretty sure I'd start forgetting the sequence once it reached ten or fifteen moves! 😄 I'd be really curious to know how long the sequence usually gets during play and how players experienced that part of the game.