Nice work, we really like wave mechanic and the art style while creating the zombies. The theme is matched nicely.
For the gameplay, it would be helpful to have some more explanations on how to play the game. It's also unclear, what's the benefit of choosing between different paths. Sending all zombies on one lane seems to work best.
Sometimes the zobies went through the fence and attacked from behind - seems like this is not intended.
Overall cool idea that can become a fun gameplay loop if polished further.