Clearly Ravi, like all the children, are very excited to be finally allowed to go out and play. The idea of a release is clearly communicated by the text, as the children, who have been not allowed to go out for so long, are finally permitted to leave the house and play outside. Note what the text says:
The children, too, felt released. They too began tumbling, shoving, pushing against each other, frantic to start. Start what? Start their business. The business of the children's day which is--play.
Thus your response will have to communicate this sense of excitement and release that Ravi, like all the children, feel.
When we come to the end, the feelings Ravi has are much more difficult to write down. The way the story ends suggests that Ravi has experienced a kind of "death" of his innocence. He had imagined gaining such glory by winning the game, but ironically, he has been forgotten. As such, he experiences a real sense of his own insignficance and how he falls into the ways of the world. Your response will therefore have to capture this sense of realisation and how Ravi grows and matures as a result.