Almost! You got the countdown and build-customization idea.
During shopping, you buy action words, place the ones you want to use in the Stall, and arrange their order. Combat is automatic: letters activate when the shared countdown reaches their matching digits.
So it’s closer to an auto-battler/build puzzle than a memory or rhythm game. Your confusion is valuable feedback—I need to make the shopping phase and automatic combat clearer. Thanks for playing!