Music games are strange. They’re strange in that there is something about the game that you can sync up with to make the game more predictable, something that’s rhythmic, something on beat. When you play the game well because you’re completely in-sync with the music there’s a strange body-extension sensation that takes over, but only for the time you feel in-time with the music.
That means that music games typically went one of a few ways. You make finding that synchronicity the main point of the game and pushing the limit of that synchronicity by pushing your dexterity and stamina, ala Rock Band. Maybe you make the music a byproduct of the player’s actions so those actions create new music on every playthrough, e.g. Sound Shapes or Everyday Shooter. Maybe you have the music be the cue for onscreen action and movement, e.g. Donkey Kong Country Returns and Axiom Verge.
Just Shapes and Beats is probably closest to the last of these, onscreen cues except that cues aren’t the easiest to judge and time.