This idea is great. Also the whole concept of two different worlds reminds me(like many others) of Day Of The Tentacle, but instead of time the two protagonists are separated by space (or even realities!?). As the story goes along and the boy and the girl take matters into their own hands, these worlds could start to interact more and more with each other, until in the end the the collapse to one or at least have some connection, so the boy and the girl finally meet. Will they like each other? Or hate?
And yes, this is rather fuzzy, but intentionally so. You know, INFINITE POSSIBILITIES!
And Hi to you all btw.