The main thing that I hateeee with 3d landscapes is that everything is too steep.
The slope from the beach to the grass tiles is too high. Grass should begin where the dark sand is and that should be the average height of all land on the gmap.
And there are so many 'ditches' randomly all over the place that are so steep that walking around feels so slow.
If you could make the 3d terrain flatter and smoother without it automatically turning into sand it'd be good.