Lovely assets. It would be nice to include some reference/example pictures in the package.
If possible, I'd like to have more animations of the treasure chest, door, portal and water etc. :)
One unit wide terrain tiles (not sure what's the proper way to call it) would be nice too, for example the dirt path in the first picture of this asset page, the minimum width is 2 unit. I found the terrain tile tool in Unity's official 2d extra package very useful for painting the scene. But not many artist are doing this one unit wide terrain tiles.