A good survival game
This game is good, but quite easy.
I like how you have to repair the wall, serach for suvivors etc but it's a tad easy at times and repetitive.
Perhaps you could add new locations? As in, when you move to somewhere new the last wall will only last so long before it is broken down and the Zombies from one area start building up and attack you? You could send people to go repair that wall and thus you are safe for so long.
I know it sounds a bit complicated but its just a suggestion. Breathes new life if you want a sequel, "they survived and decide to move on but are trapped and have tof ind a way to escape" etc
Onywho, it's good and you deserve the credit for a well thought out game-what with slow zombies,fast zombies etc. Good job!