SOMA is one hell of a ride, right from the beginning. It spins a great tale that keeps you interested and entertained throughout the whole experience. The stealth and running-away-from-monsters elements are few and far between, serving their purpose without detracting from the story. There are some puzzle sequences, but none presenting insurmountable challenges. Along the way you will need to make some hard choices - I'm guessing you may end up staring blankly at your screen just after making them; a mark of any great adventure game, to be sure. Finally, I'd argue it's not for the faint of heart. Although story is captivating, the scenario you'll find yourself in is oppressive, dark and foreboding. Kudos for the team behind SOMA.
Don't let other reviews fool you - the game is quite beatable. I've managed to win it but a single time, and in the easiest difficulty. My play time at the moment of this review is quite low (a few hours at most), but it's been enough for me to know that a very solid gameplay mechanic is behind all the seemingly chaotic elements.