Mutatis was a game in development at Psygnosis (before they were bough by Sony and became SCE Studio Liverpool) for the original Playstation. Sadly we dont have any informations about its gameplay or story background. The project was later cancelled for unknown reasons and only some artworks remain.
It seems that Mutatis had some connection with Anathor, another cancelled PSX game by Psygnosis (could they have been the same project under different names?).
Thanks to Hey Hey for the contribution!