Some bugs i find in the game.
1. two plants in one grid
2. zombie could block the raycast so player could not pick the meat
3.zombie icon refreshes incorrectly
though the idea isn't hard to find, i still have lots of fun. I suggest u could give it a try of some game mechanics which is to limit the player, such as limited time, random events. Now player can put all zombies in one road to easily finish the task.
Anyway, good job to finish a 3D game in 48 hours