I dont know if this is the place to post it and make it public, to see if this would be likeable
I get nervous when I think about destruction and chaotic climate. I suppose you could say that the new environment is too tough for humans, too tough for most mammals, but hu-mammals are fit to survive. Still, you'll need some farms...you will find that even 200 years after those devices were used for the last time, you can still see the destruction and the chaotic climate.
The races I have in mind are mostly mammals with maybe some non playable one that would be considered plagues therefore shot at sight.
yes and yes... I am planing to have some system as reference, maybe a percentage based one. and all the races are made of more than one animal (besides human) to sharpen certain roles and features.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.