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This is really cool, I really like the all the textures. 
Nice and looks interesting as a game element.
If character and/or enemies can jump or fly, you may want to add them a circular shadow , as if the sun was overhead. It will be easier to determine their actual x,y,z position.
It would be better if you used a different tile for when the grass tile meets the rock tile, so that some grass would be sticking up or something, right now it looks unnatural
The colors are a bit garish, but I like the design overall. Nice job!