This app was mentioned in 5 comments, with an average of 1.20 upvotes
Last Empire - War Z: Strategy | 4.0 rating | Free with IAP | 50,000,000+ downloads | Search manually
> World BOSS is coming, let’s focus fire! Gather the crowds! It’s killin time! Protect your empire by shooting and battling the zombie army that wants to steal your resources in Last Empire - War Z, a strategy ...
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Maybe this? I saw a couple of other games that were similar but this one does let you play as zombies too.