i'm just waiting for someone to merge all of them into one city-builder where each species has different mechanics, but live in the same world a-la civilization, with some species being able to physically live in the same space as others if it makes sense (like rats would just outright have this as their main mechanic)

Every once in a while, when going through the steam discovery queue, I will come across games like Ratopia and Ratropolis. I have begun noting them, if they seem fun, to tell my friends that "a new rat-type game is dropping soon." A couple more that I have seen are: Rocket Rats and Rat Trap.