Seirei Senshi Spriggan

Spriggan shares the giant robot theme of MUSHA, but replaces the ancient Japanese setting with a medieval-like fantasy world, full of sprawling crystalline castles and gorgeous waterfalls. This vision is well-realized too, as the art design is amazingly gorgeous. The game starts off colorful but gets darker as you fly through the veins of a tree, into an insect-infested hive, and over a castle filled with lava. (hardcoregaming101.net)