In this new mode, you cannot die, making the encounters with the various creatures less deadly, since they won't attack you. It still has all the same atmosphere, but if you've had trouble dealing with the creatures then this update might be for you.
There's still plenty to be afraid of, but now you can experience this sci-fi horror without the frustration of dying.
You can read more about the "Safe Mode" on their official blog.
About the game:
SOMA is a sci-fi horror game from Frictional Games, the creators of Amnesia: The Dark Descent. It is an unsettling story about identity, consciousness, and what it means to be human.
The radio is dead, food is running out, and the machines have started to think they are people. Underwater facility PATHOS-II has suffered an intolerable isolation and we’re going to have to make some tough decisions. What can be done? What makes sense? What is left to fight for?
Will this update bring you back, or did you have no trouble with it?