Oh, that's lovely! Love seeing kids casually killing themselves / each other just for fun.
Although for my headcanon I would get rid of the sad and lonely parts, because admitting that death leads to sadness and loneliness defeats the point of casual guro for me. So let's say instead of "he realized the blonde won't play with him anymore" it's "they finished decorating the tree, so proceeded to the next game", and instead of "he was sad and lonely at the end" it's "he found a better toy in form of the broom, so he doesn't need this now" (but there's no sadness for missing the girl, he's happy he could satisfy her so well with the broom).