Check passage settings of your tileset. There are several places I can enter the wall. Didn't like the slow walk speed paired with the vast empty place. Also there are no wall parts at the Bathroom entrance. Otherwise nice look and an interesting attempt.
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Whoops, I thought I took care of all the passage settings, looks like I missed a few parts. As for the slow walking, my original idea was something around the zombies being slow, so they should be at a walking pace, but I had made some changes to the map which really slowed the game extra, so I think I should have allowed running. I will try to update the game at some point after the rating period so that at least running is available.