As in every good game you can cheat.

In the first scene the key "B" switch the light

The labyrinth can be exhausting, so in these figures there are the maps.
Understanding these maps is a difficult puzzle by itself.

The keypad has been used for debugging, but has not been deactivated.
Its keys change the position of the camera.
A top view can sometimes help, but, as known, rotations don't commute and once you have moved the camera in this configuration change back is difficult.