Consider how Entropy was one of the scariest chapter in the story,trust me, this planet altough resembled Pluto but shaped diffrrently ,it's a world without order or predictability what you're going to explore except for the first level ahead of you
"The board music was played by a violin instrument, a melody that started out sounding mournful and then it gets rather...I guess I would call it "distorted"? It made me feel depressed and unnerved. Not something I would want to hear while trying to sleep."
Entropy basically broke the player's mental state which increases the tension and Zenith the climax of tension but I do agree with you now looking back entropy was scarier because of the realistic symbolism in it.
A flooded world with skeletons of birds, floodwaters and shadows of fish flying through the air? Or a world of time-forsaken beasts, thick forests, and eerie mazes? You decide.
A person who did a narration of the Godzilla NES creepypasta used this in the chapter, "Entropy". Don't worry, I was just as confused on why there were comments related to that in a video about Angel's Egg.