Very cute game, super funny and addictive sound effects! A few ideas I had if you'd like to take the game further (which you should):
- It would be cool to see some powerups, maybe longer run speed, faster walk speed, etc...
- One of the things I found pretty annoying was the zombies going wherever they pleased, but it does make for a fun game of like "oh, I SHOULD be going down here but I think I have to follow my horde and hide behind them" and so on, so maybe you could add different human types that when captured turn into follower zombies or something, zombies who follow the player!
Amazing submission, with a few more mechanics and some more levels I could totally see this become a fun Steam time-waster!