Fun idea! I liked the trickiness of it w/ the sound and positions changing. Not sure if the last several levels were all supposed to be the same, but I feel like the last 2-3 levels were the same pattern.
I could see an "endless" type mode working here where it just keeps giving you a longer continuing pattern (like that simon toy from back in the day) but also maybe changes up the locations and colors as you go along to make it harder to keep up with.