You're right about "all we know today about history is a fiction, told by the winners." Definitely true after WWII, true about the genocide of settler-colonialism in the New World (the Indigenous populations had to succumb to the inevitable victory of modernism - or some such bullshit), etc.

I like the twist with the immortal cro-magnon walking around. That's not so fictional either considering Homo Sapiens outside of Africa contain 3-5%(?) of Neanderthal DNA.

Good luck with your story. I really like the artwork. By the way, if you get a little time, I hope you drop by my blog and read a chapter or two from one of my novels I have uploaded on Steemit. I'd love some feedback on whether it's readable or not. The title is: Wackos to Obliterate.