Very nicely done! I really like the subtle manipulation. It makes the photo look like a perfect long exposure, but without the issue of things moving in the wind at that length of time. An instant fav for me.
I know exactly what you mean, especially since this is more along the lines of traditional techniques like double exposure. Sometimes I think it's better to be safe, though - when submitting photos to groups it can happen that deviations are rejected because they are supposedly in the wrong category. (Then again some groups refuse to accept photos created with particular techniques, i.e. HDR, just because it is mentioned in the deviation's description... HDR for example can be very subtle but immensely helpful if done right.)