These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: The Unfinished Swan
Crowning Music of Awesome: The entire soundtrack. The top two being The Unfinished Swan, and the Monument Falls. Heck, a remix of the Monument Falls can be heard in Playstation All-Stars Battle Royale.
Nightmare Fuel: The third level, "Nighttime". Environment which is extremely dark? Check. Creepy sound design? Check. Giant spiders? Checkarooni. The first area in the game where you can actually be noticeably hurt by anything? CHECK.