These tiles are decent. I enjoy all of your overworld additions, but they contrast too harshly with classic: classic has a flat style, while your work does not. Were they to have their own individual tileset, then I would increase my rating.
With regard to the interior tiles, they are harsh on the eyes. At least in one example there is not enough differentiation between the wall and the floor, and the shading is off. I advise changing the black on the floor to something that causes less contrast.
I would love to see these in their own set, as they are quite nice (they remind me of the LEGO houses from the 1970s).
