I think this game has a very cool concept, very well executed for how short it is and it could actually be a full game about 2 hours long or something.
If it was long enough to make you attached to the main character and to learn the history of this dystopia (maybe with multiple character arcs from the people who write the notes we see) and then it had the same ending, I think it would be a very powerful experience.
Now, these are just suggestions that I would do if I was the owner of this game. Even if this is all we get, I really liked this game even if it is very short and I am happy I played it.
I would have liked to see what happens to that Karl guy and to The Son of Zinchad or whatever his name is... But what it sold it for me was the ending, so simple yet so adorable, it is top notch.
It gets 4 buckets of water out of 5.