Sweet, I'll take T75 if I may!

some of the suggestions are a bit of a stretch to be considered a part of pixel art history in my opinion.  Such as the game of life.  The only thing that shares with pixel art is the square grid, but it has absolutely no properties of "art".

I disagree with this, obviously, or I wouldn't have suggested it.

In common usage, art is a (primarily visual) subset of communication, which I would describe as the union of action, accident, and interpretation.

Animation is the assembly of images or art objects in a way which conveys life, movement, or other change.

Pixel art and animation is distinct from other artistic media in that it is the study of the way in which combinations of regular, tessellating, rectilinear cells interact visually and mechanically in a way that communicates form and movement.

Since the game of life and other cellular automata satisfy all of those criteria, and in fact kick some of them into high gear, I would absolutely consider them modes or expressions of pixel art.

I would even say these are much more like pixel art than ancient mosaics or pointilism, which don't obey any regular grid and have as much in common with most pixel art as vajazzling.  If those similarities are enough to merit inclusion, then my understanding was that this was meant to be a pretty inclusive list.  That being the case, why not throw Chuck Close in?  Why not post-it art?  Why not Girih? 

I'm not even being sarcastic -- these could easily be worthwhile inclusions in the sense that they represent explorations of color and form across tessellating surfaces which might provide inspiration, and inspiring others is a much more worthwhile goal than trying to draw a line between what is or is not pixel art.

I'd love T25!

Another interesting thing with the Metroid tiles: the darker line above the top glow line is actually a lot redder and more saturated than the rocks themselves!

yup, forced contrast.  if they wanted the most breaking line, they might have gone for cyan since the rocks are already red, but it's a nice touch.  really makes the playable platform intuitively clear next to other complicated scenery.