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Just ... thinking about Final Fantasy 1's enemy sprites
(hexbear.net)
These are just like, the most important bosses. A lot of the regular enemy sprites are so nice too. Like just, what they did with such limited hardware. So nice.
Some more neat examples in this video. Legit the first hit on YouTube, so not some hidden gem, but it's got some mesmerizing examples. The only ones I didn't find compelling were the 3D examples towards the end (except for the transparency effect @9:34), but those are a small part of the video and out-of-scope for this pixel art discussion anyhow.
I found a YouTube link in your comment. Here are links to the same video on alternative frontends that protect your privacy: