I recently came across the indie game Odallus, a Metroidvania platformer that feels very much like a classic NES game. The trailer does a good job of showcasing the gameplay and aesthetic.

I haven't actually played it yet but I was really intrigued by this graphics breakdown from the author. It seems many fans were so smitten with the 8-bit style that he wanted to clarify how Odallus actually breaks the limitations of true NES art. This gets extremely far into the weeds discussing limited color palettes, sprite sizes, blends (and lackthereof), animations, aspect ratios and the whole lot.

I don't know the first thing about indie game development of this nature but I really enjoy and respect the understanding of the finer details - and when it's appropriate to break the rules. Great read and, probably, a great game!