Playable Melody Doors
I always loved the musical melody scenes in Core Keeper: it was fun to carefully figure out the right combo:
It would be awesome to solve the puzzle, open the melody doors, then break them down (they become breakable after opening), place them where we’d like (always camera facing), and code in our own musical password!
The door styles can be the same, and if coding customizable ones is too difficult, re-using the old code would still be fun!