Unpause the game. Press the 'a' key followed by typing any of the following codes. Note: Activating them seems to vary on whether or not you need to capitalise the first letter of the code after pressing 'a'. So if for example 'aaddsmallfood' doesn't work, try 'aAddsmallfood' instead.

Effect	Code
Adds 1 Bench, 1 Victim Door	addstartfurniture
Adds 1 of every clothing/accessory item	allwearable
Adds 1 of every weapon	allweapon
Adds 10 of each: Gold Nuggets, Gold Coins, Circuit Boards	allprecious
Adds 10 of each: Raw Meat, Raw Brain, Bone, Blood, Smoked Meat, Smoked Brain, Smoked Blood	addfood
Adds 10 Smoked Meat, 10 Smoked Brain	addsmallfood
Adds 10 Spider Thread, 10 Spider Poison	allother
Adds 10,000 Evilium	addevilium
Adds 1000 Evilium	addevilpoint
Adds 2 of every consumable/potion	allcosumable
Adds 20 of both Basic and Advanced Research Points	addresearchpoint
Adds 20 of each: Meat, Brain, Blood	addfresh
Adds 50 Evil Wood	addevilwood
Adds 50 of each: Stone, Wood, Evil Wood, Metal. Also adds 7000 Gold	addall
Adds 50 Smoked Meat, 50 Smoked Brain, 160 Evil Wood, 600 Wood, 1000 Gold	adddemo
Adds 50 Stone	addstone
Adds 50 Wood	addwood
Adds 60 of each: Smoked Meat, Smoked Brain, Smoked Blood. Also adds 2 Bone, 500 Wood, 200 Evil Wood, 1000 Gold, 10 Stone, 10 Metal	addbasic
Adds 7000 Gold	addmoney
Disables Fog of War/Limited sight range	nofogofwar
Fully heals all Minions	healall
Instantly Build Everything	build
Levels all Minions by +1	addxppoint
Sends currently selected ad campaign/Victim wave immediately	sendvictim
Shows the Debug Menu	dbg
Unlocks all Research projects	unlockall