Sources
C. Roth, P. Vorderer and C. Kimmt, "The Motivational Appeal of Interactive Storytelling", 2009.
Evan Skolnick, "Video Game Storytelling: What Every Developer Needs to Know About Narrative Techniques"
https://www.gamasutra.com/blogs/BartStewart/20151112/259159/Environmental_Storytelling.php
https://www.pcgamer.com/how-to-design-a-great-metroidvania-map/
https://www.faena.com/aleph/articles/notes-on-the-symbolism-of-deer/
(Sources of Colour Associations paper are in the paper itself)