This is pretty easy compared to the first one. I completed it on my first try. Just try to keep your danger level below 30% and keep killing zombies every day.
I like this game really much. The music really sets the atmosphere right, making it somewhat comical and unsettling at the same time. The game is also a really entertaining, short timekiller. The only issue I have with this game, as others have pointed out, is the description blocks which cover the screen. But overall, 5/5.
As you progress through the game it gets less challenging. In the final levels you can within seconds without the need to use any strategy. However, this game is a nice timekiller, and I quite like the style and creativity, so I'm giving it a 4/5.
This game has the lowest easy : hard badge earned ratio in the whole of all kongregate. To put things in perspective, only 1 in every 134 persons who has the easy badge has managed to earn the hard badge.
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Not on purpose, I assure you!