Scream to walk. Be aware of the demon. Walk down the corridors to find an altar and light it.  If the demon saw you, turn the lights off immediately.  Walk down the corridors to find an altar and light it.
Settings are in the screen corner (left is for silence tuning, central is for minimum sound to walk tuning and right is for maximum sound level tuning, make noise and press the button to set value) Q — hide mouse
E — show mouse
left click on the wall — make a light mark
R — turn the lighs off
1, 2, 3  or Z/C — turn the lighs on