Below, you'll see any text that was highlighted with comments from the reviewer.
I loved how I became so invested in the lives of colours in this short time. It was really lovely how you made each one lovable and unique.
I think it would be nice to know a little bit about the personality of Ray, Rain, Uncle cloud and Aunt Sun. Otherwise this was a very fun piece to read.
As for your dilemma of how to end it, I was thinking you could have the family disperse. So something like this: "It is time for calm Uncle cloud and bright Aunt Sun to leave, the children moan at this despairing event but all run towards Aunt and Uncle enveloping them in a hug of children. Then they all run out of the room, in a bit of chaos and dissapear into the house; giggling and bickering as they go."
Great Job! I hope my comments were helpful!