It used to resemble it a lot more when I first started playing (even before the map I am referencing in this post).
Either way, I think there is a lot of potential with the swamp that isn't being used—as well as the Graal castle. The current Graal castle is a real eye sore, anyway … Would love to see it redone. It used to look a lot scarier, condemned, felt more royal, and even had a canon.
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Aw snap, it has a castle and bridges and rivers! You pointed out three similarities from an entire overworld, and they typical landmarks of any RPG world.
In Zelda Hyrule Castle is always the center of the map. In Graal, Graal City holds that position. The only vague similarity is that Swamp town is south of a river that cuts the land into two land masses, north and south. Other than that, Graal's Castle lies to the west. The older versions of the map are even less similar, as the desert was near MoD instead of the south with Destiny.
To say that it's a direct rip-off of LttP is a vast overstatement.