You play as someone who is lost in the ocean. I got the ending where you remain alone despite trying to reach out and connect with people. Overall, the theme helps reinforce the idea of the game in a successful way, using aesthetic decisions such as visual art, color, and a different background. The ending I got also had an effective mechanic, using clear to emphasize the "alone" nature of the player, as you are left with only the text, "Again alone. With no one who cares." Along with this, you have the blue/black void remaining underneath, creating the sense that you're stuck underwater and alone, which is a terrifying thought to me.
Overall, the game is effective in what it tries to do ! There are minor suggestions I would say, such as using line breaks a bit more in your text so it isn't just paragraphs and allowing for a bit more exploration.