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It's the way the hero and backgrounds move (although the parallax scrolling looks very nice!). They're "too smooth", i.e. if you took a screenshot, the image wouldn't fit perfectly in a 64x64 grid of pixels, because boundaries are crossed & some cells would contain multiple colors. It's a minor thing! I still gave you 4/5 for Authenticity. :)

Oh I see. That make sense. Ok I'll keep that in mind for the next game I work on with this sort of aesthetic!