Very neat and cool idea! I was very confused at first and had no idea what I was doing, for a while I thought I was supposed to try and cut the colors in half? I wonder if I was out of sync though since I read these comments and noticed that could be a refresh issue. After going back and giving it another go it started to make sense (or it was now synced?) Maybe some sort of brief tutorial or something may help prevent some confusion?
Anyway very cool and clever design! I could definitely see something like this getting expanded into something bigger!