Now *this* is very impressive work! Reminds me how much I enjoyed playing that game so many years ago.
Technically, your maps all look very good. I love the font you're using for tips and such, because it fits well with the game's graphics despite not being an NES font.
I can't say I'm a fan of arrows, lines, circles and indications that are pasted on the actual maps, but I recognize that it's a choice a mapper has to make. As it is, it still looks very good; a bit distracting and annoying to me because of the above, but more helpful to players as well.
I haven't taken a close look to all the maps (there are too many), but I've noticed what appears to be a tiny cut and paste error in map 19, Mount Imaus, in the middle at the top. The topmost skull on the right has a thin brown line next to it that doesn't belong there. Also in map 28, Breager Palace 1, in the boss room, there's a beam and a spiral of some sorts that might or might not be there intentionally, since there are no enemy sprites anywhere else.
Anyway, those are my comments so far. Hope you keep putting out maps of this quality
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Current projects: Ristar-The Shooting Star (Gen), Sonic The Hedgehog (Gen), Sonic CD (Sega CD), Mega Man Zero (GBA), Battletoads (NES), Bucky O'Hare (NES)