I was a bit destabilized when I finished the game...
I restarted to play it a second time to discover what I maybe didn't see/understand the first time and...
Well, maybe it's still a bit short, but this is intense.
It reminds me the exercice of flash fiction: "Write a poignant story in very few words" (There's a lot of twitter account which like to post short story in 140/280 caractheres and there is also the famous story of Hemingway in six words). Your game is a bit like this : not long but enough to let the player think about the story and imagine what was before and what will be after.
So I think you made a good short game with juste little time!