Breathing Bag by Matt Clark and William Pyle is a throw back to creepy atmospheric worlds in movies and video games.  The bag breathes normally until it senses people have approached it, when it then begins to hyperventilate.  Smacking the bag will cause it to recoil in fear and pain.  What makes atmousphers creepy in horror based worlds is not in the jump scares or gratuitous amounts of blood and gore but in the little aspects that give the world life and the uncanny, half-recognition of something distorted that somehow reflects an element of humanity