You are an armor lacking your heart, because the evil witch stole it from you. You need to get it back or you are doomed to a lifeless life. But this sounds easier than it is done. You have no idea where your heart is and your only guidance is the heartbeat, your heartbeat. The faster it becomes the closer you are to it. Or so you hope...
(If you do not have headphones you can also see the heartbeat in the upper right corner)