This is a really cool concept, I think it executes on the theme really well. Sound WOULD go a really long way, I was misisng that a good bit, but this was cute and I enjoyed watching the expansion happen. It would be nice if the cursor indicated a bit more clearly where to shake on an object because that confused me for a long time at first, but once I figured it out the game was easy to pick up. I found it a bit difficult at first too to understand when an item was added to my inventory or when it was going to an animal.
The first squirrel darting out into the fog was really satisfying!