Eternal Legend feels older than 1991 when it was published. Looking at the ways that it feels anachronistic might be interesting.
The other elements of the game is pretty basic. The battle system is a basic Dragon Quest like system. The music isn’t astonishing. Towns look a lot like a basic NES RPG, if you ignore the sprite complexity. For example, note the subtle details of how the logs make up the house on the lower right, or the stone on the roof.