The most beautiful part of your photo (the sunset) has the least space given to it. I'm sure if you had cropped the pic much harder to loose the dark area below the sunset and almost all of the white foreground it would have done much better!
This one made me smile, just knowing that last week, somewhere in the world, a photographer was sitting in a playhouse watching the sunset. I think your flash was a bit too bright though. You might have done better with a flashlight shining on the back wall of the playhouse (since it is white it would have bounced to provede some illumination) and a longer exposure, which would have given you a more balanced exposure between the sunset and the inside of the playhouse.
While this definitely fits the challenge, I don't personally find it particularly interesting, and it feels a tad imbalanced with more white to the right and top than the bottom. Also, the blown out whites contrast just a tad too much with the shutters and the view (to my eyes, anyway). The shutters also clash a bit with the view, which is not, in itself, very interesting. Overall, I do like the photo - it has the potential to have very vivid colours, and it's very creatively done - but I would like if it felt a bit more balanced.