Hi! I just finished reading Oreo and wanted to tell you that I really liked it. It is a good idea, and the book has much potential. One can feel that it is a young writer (new to the field) who has completed it, but it shows your talent.
You could probably improve it a lot by coming back to it to polish the plot. And well, it can go in so many directions that I cannot tell you how it would be best. That is only your choice to take!
Though one thing you should definitely correct right now: at the end, it is WW2, not 1!!! :D
Continue polishing your talent (if you want :P), you will do great things!
Cheers!
coco