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RAAGGH THIS IS SO GOOD
Something I really love about Sunny that I don't see mentioned a lot in discussions about his character is his guilt over ruining Basil's life and how it manifests in his vivid fantasy.
Basil appearing in black space and getting killed over and over, first by the environment, then by the others, and finally by Omori has gotten many interpretations. Less believable ones like Sunny secretly having hated Basil all along and more believable ones like Omori wanting to protect Sunny from the boy who knows the truth.
But what I like is how it could also show a part of Sunny he doesn't express often, and that is the guilt he feels for dragging Basil into the accident and making him an accomplice by being the one who caused there to be a situation that made Basil act so inhumanely. When Sunny finally leaves the house, he sees the effect that had on Basil for the first time: he has lost all of his friends, one of his closest friends now leads a band that bullies him, he lost his most prized possession, and that bright, sunny, sassy boy now barely dares speak, exhibits signs of suicidal ideation like giving up his hobbies and giving away his important possessions, and has lost all that personality that made him such a charming little kid when he was twelve. And through it all, Sunny wasn't there for him. Like being trapped wandering in black space, Basil had to face it alone.
Knowing that, black space can take on another layer: look at what I've done to you, taking your life away from you and turning your friends against you. I might as well have killed you myself. It's a reel of the outcome of Sunny's actions, put on display as another point of shame and regret in his life.
And I think that's pretty neat. In the good ending, I can see him struggle with facing this part of what he's done as it makes his reconciliation with Basil tougher, albeit that much more cathartic when they do reconcile.