Alone on the roof

How do you survive in a post apocalypse world? It is not easy to accomplish, bro! So I have to make some heigh risky and dirty work for group of corp scientists. yea.. only this way those fellas will give me a medicine for my little dauther. They also promissed me a place for us in their shelter. But first i need to complete all of their missions. Killing zombies and collecting some crucial samples or something. Any way there are no much choices for me here. Let's do it together!

In this game your main purposes are:

- Killing particular count of zombies;

- Collecting particular count of crucial samples (white suitcase);

- Reach evac point (mostly moving up to the roof);

- Staying alive.