This one didn't resonate with me as much as it did for some other people, maybe because I've never had a relationship like Kai and Caspian's. (The protagonist's name and gender is customizable, but I'll leave them as "Kai" for simplicity's sake.) I've never fallen in love with one of my friends, and I've never had a friend I've talked to consistently for more than a few years, actually. Which is kind of sad if you think about it.
But hold up, this isn't supposed to be about me! The game itself is pleasantly nostalgic, it rides the "childhood summers by the beach" vibe hard and does it well. My favorite part, though, is the endings. I found three different endings you can get, based on your choices - either (Spoiler - click to show)Kai doesn't meet Caspian and sells the house, doesn't meet Caspian but keeps the house, or meets Caspian and gets taken underwater by Caspian where presumably Caspian reveals that (le gasp) he was a merman all along! And then they live happily ever after.
The happy ending's fine, but the sad endings attract me more because that doesn't happen. Count on me to like the depressing stuff. They're made even more melancholy in context, when you realize everything Kai has lost forever by giving up on their dreams and succumbing to the dreariness of daily life. Abandoning their dreams of music to get a "real" job, moving away from their childhood beach home because their grandparents are dead. The ending I got first, where they just stare out at the ocean while thinking about everything they've lost, was a good one. There's no resolution there, just a friendship that ended on a sour note and a person they'll never meet again. Lost childhood memories you won't get back.
I dunno. The thing about the past is that you can't relive it, no matter how hard you try. So in this regard the happy ending feels like a fantasy to me and the tragic ones are more true-to-life. But maybe I'm just depressed.
Playtime: ~15 minutes