Idea and Backstory to Game Level Design

This is a simple mood board stating my idea for my game level design.

I am going ahead with the theme FEAR. So far, my level environment inhabits a forest with treehouses around.

My Backstory:

Inspired by watching the TV show Supernatural, I have decided to add a mythical history to my environment. I have also used information from the web series 'Clash of the Gods' to research more into Greek history and also used the book 'Greek Gods & Heroes by Ann Birchall & P. E. Corbett.
This website helped, http://www.touregypt.net/featurestories/royalcults.htm, I tried to make sure that I used different sources for my idea and backstory.

Story Myth:

It can be said; the Greek Gods lived peacefully high up in the trees in houses connected by branches. There was peace between these Gods as the goddess Gaia made sure no one caused a conflict on her Earth. However, when she bore children for her husband Uranus, one of their children, Cronus wished to overthrow his father. During this fight that took place in Gaia’s houses up in the trees, her husband and son destroyed the houses and left them in ruins with Uranus spilling his blood into the river below the earth and contaminating it making it poisonous for anyone to drink. This is where I hope to make the lakes in the forest the colour green.

Gaia decided to abandon her home and sought another planet to start a new life. Many years later, the tree houses on Earth were left in a disgusting state with old branches growing between the houses and leaving green moss growing around. The weather constantly rains making the wood wet and slimy and the smell mimics the smell of a sewer.

That is the main foundation of my story behind the game level I am designing. I shall be creating props with Greek and Egyptian symbols in mind.