Underrated game. Fits the idea really well and it was fun to play. Took me a while to understand what it is I am supposed to do but when I did it was fun trying to place zombies in a way that confuses the player(AI) and kill him. Well done
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For a jam game you can save time and just create a simple help menu that shows all the controls and explains the game. For a larger project a tutorial maybe. In my game I just made a popup screen that explains controls. Not very clear but better than nothing. Don't worry though your game was still pretty self explanatory after I saw the guy shoot my zombies