The rats do die.

This sure is a game

A Spore-like game kinda like Tamodachi Life.

Has a forced death mechanic for no reason other than realism / irl morality at the cost of player QOL. Devs moral grandstand about backyard breeding but do not donate proceeds to animal rescues.

There's no breeding, however, there's random mutations that can alter appearances. A sweet cheap little game made by a nice chill guy.

Create some frogs. Major difficulty curve for mid-game and late game, and unbalanced income from frogs may make the game unpleasant if you aren't good at RNG.

A Spore-like game.

A Spore-like game.

A Spore-like game.

You can mod to have a genetics system, but it's got Sims DLC Disease. Not worth the price.