Floating Islands
Rather than the sprawling featureless landscapes often seen in sandbox games, the floating islands focus attention in a specific area and also prevent the player from getting lost.
With a smaller area to cover, sessions can be kept short, with tasks quickly found and completed. Revisit areas as new content becomes available following completion of other objectives.
In addition to the benefits of the floating islands style in regard to affect on gameplay, it also fits nicely with the low polygon aesthetic.