I just don't think it's suited to the medium. Without a human element you really need to get readers invested in your story - and characters are a big part of this - particularly if you're telling a 5 part tale. Since there's no foundation of human relationships to build off of you have to sell the world to your audience. And is the message of Oddworld really enough to carry a novel by itself? If it was a one off commentary on the state of our world you could probably get away with the broad allegorical nature of it. Maybe a little like Animal Farm. Then I feel you're going to be peeling back layers on characters that are probably best left as broader caricatures. I think it would also be much easier to sell the balance of humour/dark themes in more visual mediums.
I just don't think a series of novels is going to be all that compelling. I don't think it's that type of story.
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