Grassland

The shading on the hills is kind of messed up. It should go from light to dark, not dark to light in this setting.

Good, but next time make it so your top ground tile acts like a ledge instead of a solid block to avoid hill tripping (usage of solid tiles at the end of an ascending slope instead of ledge tiles make Mario slightly trip when walking there). Also, don't include useless folders and duplicate palette files.