This is really good, I personally love the cubescape/brickscape. But just to help, some constructive criticism.
Pros:
-Custom Made Trees
-Realistic change of terrain color
-Looks more amazing with shaders
-Would look good as an adventure game
-Good use of hills, and vertical drops
Cons:
-Terrain has only trees
-Bit plain on overground detail
Possible Improvements:
-Bushes
-Flowers
-Rocks
Overall, I would give this a 9.5/10
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