Lately I was reviewing my own "stories" and I remembered a very curious novel, which I don't remember the name of and I forgot to save it: It is more or less like this, a novel in which the character literally evolves, he starts out as a slime and devours a salamander and gains the body with the skills, then the body has infant stages> young> adult> elder, then he eats more and getting new bodies and skills, if I'm not mistaken there is a plot with multiple worlds, and the protagonist has to flee to another world to avoid being caught and killed (it's not slime data ken). It is more or less that I will try to remember more if I can.
Hmm, I don't know any novels like that, but is it Japanese? Because that's what it sounds like, maybe adding what language it originated in would help others find/remember it.