Per wikipedia: A form of digital art drawn with graphical software where images are built using pixels as the only building block. We give games full scores in this aesthetic category when they have 2.5d art like Rogue Genesia or other similar vibes as well. We’re measuring aesthetically, not scientifically.

But there is an importance gameplay wise, leading to the inclusion on the scale. Games with pixel art are often able to have much more going on screen and slower movement can also feel more immediate. 3D rendered characters often look like they are moving in slow motion in a survivors-like, with characters looking to walk through molasses if a game designer isn’t careful.