I am in love with this game. And to learn that it was made in just a few days (fine tuning excepted) blows me away. There are so many talented indie devs out there I could probably spend the rest of my days playing these games and never get through them all! I'm also happy with the sandbox option. Not all games of this type have that. Kudos.
One critique: The music loop is choppy and could be faded in and out so it doesn't disturb the experience.