I really like the color idea and the progression through different colors. Have you done much research into color symbolism? A lot of it is honestly really instinctive, and in a visual medium like a comic, I think it would work really, really well, especially in invoking mood.

I can definitely see the link between Indecision, Indifference, and the concept of purgatory as an in between place, a limbo place where you sort of end up if you don't take charge, form an opinion, can't make a decision, just don't care, etc.

The red area makes me think of the field of poppies in the Wizard of Oz film, and the orange area makes me think of the Grand Canyon. I really like the mental picture of the forest with yellow leaves as well - seems dreamlike. The other characters they meet also sound integral to establishing the characters/furthering the story/exploring the themes/providing conflict. Is there going to be one extra character per color section? Do any of them (like the Witch Doctor) repeat?

You had to end on a cliffhanger, didn't you. stare

I'm really looking forward to hearing more about it!