So, from moment to moment, you're exploring the house, looking for keys, tools, and other objects that will help you escape. The wrench is one of the most important items - you need it to fix certain things around the house, like a broken door or a pipe that's leaking water. It's all about being stealthy and avoiding granny's gaze.
As you play, you'll start to notice all these little details that make the game so immersive. Like, have you seen the way the lighting changes depending on the time of day? Or the way the sounds of the house creaking and groaning make you feel like you're really there? It's so cool!