Nice game! I know exactly what you're going for with the time-based farming, but think having an 8 minute timer before the zombies arrive is a bit too long for a game jam, when people spend an average of 5 minutes or less reviewing each game. 

Also, a little music goes a long way! It's hard to squeeze audio in when we have a week to make a fully playable game, but even just grabbing a free 1-minute loop from somewhere will add a polished feel.

I got quite scared when the night came and suddenly there were zombies SPRINTING at me, which is exactly what I wanted. Well done there!

I like the idea of mixing a farming sim with waves of zombies. I feel like maybe the timers are a bit too long, because I started to feel a little bored waiting for stuff to happen after planting the first area of crops. It's a good start!

A cozy game

I only planted it in the closest area and survived until the 4th wave