"The castle wasn't here before the monster problem and it seems to have difficulty deciding on what time of day it is."
Look Closer at Habitat
This location is not like any other locations in the land.
First you start out with a background that indicates nightime, and switches when you go onto another stage, this continues on until the last stage, which is sunset.
There are statue of the a two-headed dragon that might symbolized the Final Boss.
There are also mountain in the background.