Very interesting concept. I enjoyed the uniqueness of each employee you hire. My main problem is that the attack screen is always the same. Seeing zombies attack the same building with no progress is not enjoyable. The jokes are funny but are very repetitive. A suggestion would be to see your horde of zombies head for the city and then jokes being accompanied by an animation of the joke. Another problem is that there's nothing happening outside of the random events. There was no reason for me to look at the game while I was waiting for cash until I hear the notification of an event. If attacking wasn't so difficult or there were more like-leveled cities, it could have been more interactive. There's also a grammatical error in the second sentence of the Company Upgrade "Parts Recycling".
In summary, I enjoy the concept, but the game suffers from repetitiveness.