That's what I was thinking too - puzzles. Each level could be a particular music sequence, and you need to program a drum loop that satisfies the conditions. Something like that anyway.
Thanks for checking it out!
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Kerflux is a nice casual game that has you "uncovering" the correct input with audio and visuals - something like that could work well in the puzzling space. On the other hand, it seems a shame to limit creativity by asking people to find a particular solution. But then, I can't think of any ways to keep it creatively open while still having a meaningful goal.
Either way, I loved it!