So I went through the text files and found a hint from the zombie girl, saying there's a secret in Annie's level 2 (the quadpuss and zombies level). The line says that there's an easy way to kill all the zombies in the level if you go to the secret pathway on the top left.
Found in dialogs.csv
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I was surprised because I talked to the zombie girl a lot of times but somehow she never told me that, so I found it interesting.
Also, it seems like the next enemies LAGS will add are "ghost jellyfish" and slimes, which names we can see in the placeholders for the 'erotic images' gallery and also in the dialog files. Strangely, it looks like Annie would talk about the jellyfish in level 14.
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I'm guessing the growl part is about the brown zombie. Still, it would be odd to add a new enemy in this level and not on a future one? Just theorizing though. LAGS could change this at any point.
There's a lot of interesting things in this file if you wanna read it. Just go to Hailey's Adventure_Data\StreamingAssets and you'll find it. There's text about content that hasn't been added to the game yet, like I said, so don't read it if you don't want more spoilers.