I read it and found interesting facts about rainbows!
And how come the person called Rachel is telling the story from her point of view but it was from another kids? Sorry if its there and I forgot to read it properly I like it though! Please please do more!
There are a lot of good ideas floating around here. That said, it's rather hard to critique without reading the whole thing. Is this the entire first act? If so, the individual scenes could definitely be explanded. Introduce more side characters perhaps?
At this point, I find the Rachel/Helen deal (which I assume you'll explain) disorienting as a reader. Unless Rachel/Helen is a nutbag, I also don't think she would directly comment on Cody's mysterious appearance in all her activities. There are probably subtler ways of establishing the fact that he is imaginary.
Though I haven't dug that deeply into it, I'm guessing the light bulb talk and games are metaphorical. Super cool in my book.
I don't know much about play-writing, but I really liked this! It was really interesting and it made you think. My only suggestions are that you write more of it 'cause it's really good!
Okay, who is Helen and who is Rachel? I couldn't quite sort it out...
I also couldn't quite see it in my head. It was just...OK...who is Cody? Who is Ms. Parker? I'm not a real expert on plays, but usually they have something about like who they are and what they are wearing.
Graffiti is the most passionate form of literature there is.
I like it though! Please please do more! 
