Sorry, I couldn't get past the first minigame either. I managed to get to the bells up until the bells. For some of them I can't see the color variation, or at the very least it's far too subtle to discern. The real problem too is the timer forcing you to spot the difference in only 2 seconds (in a screen filled with 20 same objects), so if I take the take to think even for 1 second it's too late.
Too bad as I really like the art for the characters and the concept as a whole. The music was cool too (until it stopped playing :c)!