As with anything, there is a twitter account which collects them https://twitter.com/cnviolations/status/1747166763400212593

Brothers: A tale of two sons. Not a unique experience, as it almost seems like the whole point of the game is this one moment. So, spoilers… Its control scheme is each analogue stick independently controls your two characters, two brothers. And it’s a fun puzzle game where you have to resolve moving two characters at once in this way, moving, balancing, timing. It’s all fun and games until a tragedy, the older brother dies. He was one of your control sticks, now for the rest of the game half your controller is dead also. And you walk back out of the cave past all the puzzles you did with your brother, which are made for two people. You’re useless, and the feeling of loss is staggering.