Oh! So the way I designed it, it gives you feedback after you played 4 tunes. Do you think it would be nice to show on screen what colors you have already played? I am trying to brainstorm. :) thank you for going back and letting me know! Also yes the pink and purple were quite similar, the light was the cause of it. I tried to distinguish them as best as I could and don't be very dark (since they are a light). But I understand the confusion.
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Yes I think so - since when you press N, there's already a familiar mechanic (that's a core feature too).
I was going to suggest some animation / vfx, like everytime you hit a color, it would vibrate the clock or sparkle with the yellow shader you used. This seems fun, but it's a bit more work and also break the clean, visual cohesion you presented - so maybe that's not the answer.