For a game as simple as this, it managed to keep me attentive til the ending. The story line, which I understand would be the thing you are trying most to show, was well executed and understandable in spite of not using any actual dialogue.
The only thing that kind of bothers me is the music. With no offense to anyone, but the music sounds like there was really no effort put into the soundtrack. it sounded more like a person who learned the C Major scale and two chords, and that was the whole soundtrack. If there was a little more effort put into the music, this would've been great, especially considering the amount of time it was made in.
It felt difficult to feel sad when the music didn't give very much emotion, but otherwise, good game.