More gorillas

[quartz jewel]

Make everyone a gorilla

[untold matrix]

Try Ape Town mutator. It's just visual but it does what you said

[red turtle]

Hey, but come to think of it;

Matt said somewhere (probably the steam FAQ) that he wants to separate races (Human, Gorilla, Vampire) from professions (Gangsters, Shopkeepers etc.).

Why not introduce a monkey fever virus then? (Plague Inc. vibes)

[sturdy portal]

Simian flu

[cold ermine]

Scenist gorila