I think this fits the theme in a few interesting ways, with the out of control zombie horde and also the lack of direct control with the zombies following the cursor pretty loosely. I really loved the special zombie types you get for killing humans with harder weapons. I think if taking this further, it would be really cool to only have to kill some of the humans to complete the stage, so you're making more interesting choices about who to kill and whether you want to risk taking out harder humans or not! Good job!