Yes, there's also the graphical glitch in Dead River where patches of the ground change textures as you move over them. This disappears when you raise the water level via the Storm Circle.
With regards to the concept art, upon completion of the game I was unable to view any of it aside from the first one you unlock (Vykker Pod). Restarting the game doesn't work, nor does completing the levels again. I'm pretty stumped.
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