Well, about that w2-overworld:
Red: Cutoffs, 1 false line, 1 false colour
Yellow: That's where paths could be (and should be) with the right tile
Blue: Is what I don't like. First, the thing up there near the fortress. I just hate when you go 2 8x8 steps higher, only walking. The other blue things are boring areas, because it's like ten time the same tile after another.
Then, we need more different and also not default palettes. This map, right now, is boring, and does look like the mushroom kingdom map coulourwise.
Then, the thing I circled purple down there is used to often.
Also, it isn't really a river, because there are the standard sea waves.
Sorry, but I think the overworld needs much work. If the creator has no problem with it, I can edit it. Because I don't want any overworld of this hack having middle-level-quality (if that's the right word).