Y'know, I think I'm okay with 99% of the changes to TTYD in the remake. Even the altered dialogue here and there is okay for me, honestly, since there's so much else that's tweaked that it just doesn't stand out as much.
The only things still bugging me are a handful of environmental decisions, which I suppose should be expected. Rogueport is still just a tad too clean, but it's clear that they spent a ton of time trying to carry so many small details over that I'll give it a pass for their otherwise admirable dedication to being faithful, even down to specific cracks in windows.
I don't really like those... bushes? Rock pillars? Whatever the blue things with eyes are. Them being made out of just two flat planes interlocking seems a little unusual, considering they've shown other ways to stylize rounded objects, like the pipes and the Twilight Town pigs. I'm also not quite a fan of the water being paperized, but I think I can get used to it, since it's still rather pretty.
But the part that's actually bugging me? I don't like how all of the ground has that waxy, reflective sheen. It works great for the polished wood floor of the stage during battles. But for the grassy fields? ...Not so much.
Even if we go with the "well, the art style is that the environment is meant to be arts and crafts mimicking natural materials" explanation, there's still a ton of texture variation with different varieties of paper, cardboard, etc. in real life, so that doesn't really justify it.