Put an end or make it wider
This game accomplishes to exploit one of the last Z-culture aspects that haven't yet been spoiled enough (the post Armageddon zombie-science) which allows me to call a clean closure to the Zombie Era in the media.
It although Managed to make me see a zombie like a primitive creature (with vulnerable behavior) instead or a mindless moaning weapon or dull plain videogame's foe.
Now there is a huge problem with "Lab of the Dead" which is the lack of influence for the player to apply on the story development.
Not only there is no multiple ending, there is no ending at all. There is not a final goal to seek, there is no way to loose or win. This is as much a Psycology-Sim with very short term goals.
In short. In a way it would work as a "doodle god" if there where a way to use your research to solve the Z-apocalypse (aka win) or it could work as a "The Sims" if the possibilities would be wither.
As it is now the game is isn't completed (IMO) if it hast at leas a way to solve the Z-situation.
Suggested item: Food: Zombie meat: (AR = hunger+ Humanity- Mood- = eats Z-meat)
Suggested endings:
(tamed ending: AR loaded gung + AR human meat + AR animal Alive + AR carrot, apple, banana and chocolate.) release an army of veggie zombs to reduce the other walking dead.
(wild ending: all melee AR+ all aggressive reactions on dead animals + AR unloaded gun + AR Human meat + AR zombie meat.) Release an horde of macrophage zombs to devour the other walking deads.