When we started discussing the idea of a game that combines shooting zombies and nurturing babies, we knew the location of the elements would be really crucial. We soon realized that locating the player in the middle of two parallel mechanics was the best thing to do. That way, the player would be only able to focus on one mechanic at a time, impossible for her/him to control the other. But we needed something else to make sure the player knew something was going on behind. And there's where sound came in. We decided to use the crying of the baby and the zombie growl as a thread to bound both mechanics, so that the player is always aware that something bad is about to happen on his/her back. Though the crying of the babies and the zombies' growl might sometimes seem like a torture for the player, we kind of intended to emulate that experience from the beginning, offering the player a stressful situation, where no matter what he/she does, she/he will always feel out of control. You can play online here Don't forget to rate it, if you like it! ^_^