So, he decides to run away from his memories, and then for some odd reason goes, "You know what? I'm sick of this" and decides to DESTROY his memories, and then ends up back at the beginning and wants to run from memories again...
In different endings, he's like different people. When you kill the sub, he's the monster hearing their screams. When you save the kid, he's the kid. When you die by sub, he's... I dunno...
I think the second was the best. It's like you want to get crystals so badly, and have to get those pink squares to help you in order to do it, you give up what makes you YOU. In doing so, you actually end up losing your sight and being like a pink square. In this one, it's like the last stretch of your journey before death or something, and you just need a friend.