Personally, I think the first four entries (That is: Even Eater, Outer Space, Fantasy World, & I Dream In Daytime) are so similar in style and tone, that they would benefit from being interwoven into one narrative with a climax or something that brings them all together in the end, if possible.
That said, the first four were my favorite shorts here because I think they do a really good job of catching that essence of childhood imagination and playfulness. And while I enjoyed these a lot, I do think the writing in some parts gets a little too repetitious in terms of word choice.
The next four stories did not hold my attention quite as well. I think this is because the first four focused more on the eccentricities of the protagonist, which characterized him very well. These other stories just feel like random childhood scenarios. Slice of life is fine, but I feel like it could use a bit more depth, more introspection, more of that characterization from the earlier entries. (Off topic, but are these all supposed to be autobiographical? It'd be cool to have a grandma who knew Al Capone).
My main criticism in general would be the repetitious words and phrases. Grandma at the Fair is the biggest offender. The main character states that its raining way too many times that I got annoyed. I know you want to capture the voice of a child, but I still feel it could be more succinct. Instead of mentioning rain a 5th time, maybe mention dark clouds, giant puddles, gusts of wind, etc.
They are endearing stories, but need a little refinement.