This is one of my favourite Kirby titles, and what made it different was that all three sub-species; Human, Eternal, Deviant, were earthborn.
Even to me, 'reimagining' them as alien in origin makes them too similar to the Asgardians, particularly the influential crossovers with world mythology and demonology. For the many cinema goers unfamiliar with the backstory, for the non-comic readers, that's much less acceptable a flaw.
I prefer the much colder, clinical idea that we were nothing more than a triaged alien experiment carried out here on an indigenous anthropoid species, which might soon be judged to have failed. Also, there's the tragic hypocrisy of the Deviants, claiming to be comfortable with their genetic instability while attempting to control it by exterminating the unluckiest, most deformed members of their society: something again better examined Kirby's way. IMO.
For me, one of The King's darkest and most powerful creations, and, at this stage, I suspect the film isn't going to measure up to that standard.