Soma's story is great if you haven't read up on the philosophy of consciousness or the meaning of humanity. However, if you've already entrenched in these thought exercises and don't come to the same conclusion as the main character, it gets a tad cheesy.

As for gameplay, if you've played Amnesia: The Dark Descent you've played a medieval fantasy version of Soma. I'd say that one of these is a must play, but after you've played one, the other isn't as unnerving.

I'll start my recommendation with a question: what if when you fall asleep you're actually dying, and when you wake up you're a new person with the same memories? If you find this thought frightening or interesting, play Soma. Otherwise, play Amnesia: The Dark Descent.