A few key concepts that need to be addressed:
-Theme:Zombies and puzzles don't go together. Vague plot.
-Skill:Its too simple to play.[Rush shield,Spam it in every fight. You'll win every time.]
-Tweaks: A few illogical things like the dudes car being so far away.
Opinion:3/5 I like the concept of the puzzle with using abilitys and so forth to help you.