This games is awesome! I do agree about switching specimens and the stats monitor suggestions, and it can get a bit grind-ish in the later levels, but i loved it. No other game or instance in my life have i ever felt compassion and an emotional attachment to zombies.
I spent hours teaching a zombie all the passive and advanced reactions until i remembered to research the alpha team stuff! The zombie animations seemed so genuine and the voice acting was great too.
To top it off, i can supplement the kind emotions with savage pleasure by destroying them with all kinds of weapons. Overall, one of my favorite games, 5/5 from me.