There's no way of me knowing if this game has anything more than a Level 1, once I clicked on the zombie it turned human and then that was it.
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Yes there is 2 levels in this game, its an unfortunate bug if you continue to click on the zombies almost like button mash on them in a way (usually its the last one you transform) it will bring you to the next level. This bug isn't in the second level it should end once they have changed all of them to bring you to an end screen.