Hola Lalia

The narrator is indeed feeling included in that group of the other kids. If you read the text again you can see how he is from the beginning talking about his own experiences as a child and he says that his favourite game was the "comba" so it's not really strange that by the end he uses the first person plural as a "nosotros" (as if one of them was himself).

I hope it clarified it.

Saludos