This was... unexpected.
This is not really a game, nor this is hardly an interractive story : for what I can tell, the story is yours to imagine.
You start the game not knowing what to do... and before you know it, the screen is black, a single happy face pops for a seconde, and you are left with an odd feeling.
What was that all about?
Strangly, my 2nd playthrough (after reading the spoiler and comments) left me with a real sensation of loss. I guess this is because I was "supposed" to feel that way.
I think this worked well because both the audio and the pacing were very well done:
- Playing a few notes when something happens in the game is a VERY nice touch. They fit the music perfectly and capture the meaning of the action.
- The dog disappears just when you stop running around with him, and you are given enough time to experience the loss before the screen turns black (but not too much time)
Also I agree with the comment saying you should add more interractions, especially with the dog. This could lead players to forge a stronger bound with the dog and actually "get" the meaning of the game on the first try.
Nice job, this is the kind of game you remember for a while.