I liked the pixel art and simple controls. I didn't expect the zombie apocalypse game but it seems to fit the theme nicely.
As for the game itself, it was a bit difficult understanding what do I have to do. Once I figured out what each icon means, the game became pretty simple. What I didn't like is that after a while game got a bit repetitive and there is no way to track player's progress. Was I doing everything correctly? Or did I miss something and was stuck in a loop? But it seems that I did alright because my team escaped.
Great job! Good luck in your future projects!