This wasthe initial concept of the light world and dark world for the game. As you can see there's a big contrast between both realities. I also thought it would be interesting if in the dark world some of the structures were altered.
After playing with the design a bit I came up with these layouts for the light and dark worlds. This is merely a layout of the physical space in which the player will be able to occupy. Thus far there is not much gameplay designed in here yet, but each area has been built up with elements of gameplay in mind. As you can see form the left to right path, there will be many platforming elements.
Here I have a rough build of the level's geometry. I've placed a character in the corner for scaling purposes.