My first playthrough of Little One took 6 hours and I received a “pretty good ending” according to the game. I see the Achievement I got for this ending has only been found by 18% of the players on steam, so I feel pretty satisfied. I see some people giving it harsh reviews about the quality of the writing, but I disagree. It felt very natural and very heart felt and emotional to me. I enjoyed it very much. I do think every playthrough is different so your mileage may vary.
My little one ended up enjoying painting and writing stories and the stories he wrote were very beautiful and sad. I enjoyed that aspect a lot. He told several stories. For example one was about a star that fell to earth and took a girl to heaven. Another story was about a mushroom who could only watch children play but couldn’t play with them. And another story was about a horrible monster who could never die.