I really like the concept you implemented of having a mix of 2D. However I would probably still make any of the 3D object more cartoony just so they don't stand out from the 2D art. However I liked the amount of animation that you added for both the player and the goblins. And having the dragon fire blast as a way of attacking was fun. Another thing I would try and fix though is some of the images have are low res and it might be a case that you have to mess around with unity to get it clearer.