WARNING: THIS GAME HAS JUMPSCARES. You're in a cellar for the night, unable to leave due to nightmares roaming free in the abandoned house. Navigate from them. Red teeth? Use your light and shine it back into the shadows, it's a nightmare come true. Purple teeth? Avoid the light, for its sensitivity to it is different and may only enrage it. The blue teeth? Click it in the clock area before it makes you panic and leave you vulnerable to other threats. A strange darker silhouette when you hear the door close? Shine immediately, just even a second longer, and you're subjected to a strange agony. Do not let them get to you...
Getting killed by The Dark One (the one that doesn't have a proper color of teeth) would be bad, I can't tell you.