Ok.. Recently I finished one important part of my personal project - Swale Eaters. It's all about evolution/degradation of main character:
It is a random guy living on the swamp. This guy becomes addicted to protein taking a new degradation place in creatures foodchain. Following the path he is slowly loosing all human signs like speech, vision, consciousness and ability to move, obtaining a bunch of new attributes - teeth, extending tongue and claws.
On the last stages he eats his own tongue and after that his adventure comes to an end.