A little short...
It is all there as a shooter apart from more levels and som upgrades.
Not a good idea to talk your own game down before people play it and havent had the time to checkout back story on dA but I'm sure if you post this there it will get a better review than here as NG is more about the game than the art.
As for the art: The dragons are good but the wing flap could use some frames. Background on lose and win screen need a lot of work. In all elements as still bits of drawing are good but animated look a little forced.