I hate being in the ocean. Shallow beaches, I can handle, but the deep sea terrifies me more than spiders, snakes and birds who can talk put together. So a game where you do nothing but drown in open water is not my Game Of The Year candidate.
That's not to say it's not effective, though.
You "play" a French dude who falls off a boat. And no matter how good a swimmer he is/you are, or how fast you think you are, eventually you will run out of energy, you will drown, and you will die. It's a dark, harrowing experience.
While at the end of the day this is an ad for "yachtwear" company Guy Cotten, it's a better advertisement for always wear a lifejacket. Play the 'game' here.