>>535740673
The killing Dream Basil stuff is more about silencing the truth, but...you know. There's only so much I could dress Omori killing/letting Basil die as to ignore what it is. At the very least I don't think Sunny seriously wants Basil dead, as much as it is that he can't forgive Basil or himself for what they did. Which is why he can leave him to die in one or two endings.
I still feel like if Sunny killed Mewo, that would be much more foreshadowed. References to the tree stump and jump rope appear in quite a few places, even the tree itself appears in some Headspace areas. Vast Forest has a tire swing that Something appears in front of, for goodness sake. Even hanged Mari's can appear outside Black Space, like the one in Lost Forest. The truth always bleeds in. If Sunny did kill Mewo, especially by "accident", than I feel like something like that would bleed into Headspace more. Like the spider Mewo's, which don't seem to have much behind them.
Mewo being removed from White Space even if you don't kill her is reserved for the true route where White Space goes empty before breaking the lightbulb and fighting Omori. If you give up, White Space returns mostly to normal and Mewo appears again. The "You did it :)" sign doesn't appear in Breaven. It's in a disconnected area, and it's referring to hanging Mari. It has a jump rope right in front of it, and I don't remember a cat being in that area. Sacrificing the cat in the sacrifice area summoning the Hush Puppies could mean something.
I will give you the sketchbook, but mostly because the Black Space version adds a knife being stabbed into the cat sun. But that could also refer to Sunny because sun, and Sunny is sometimes associated with cats. Omori's sketchbook is weird.