Neat idea for a game that fits the theme in a very nice way. Lovely music that is fits the game very well. I loved the little facial expressions, especially when you're trying to become smaller when you're already as small as you can get, so cute!
If the controls weren't so finicky I would have had a way better time, but unfortunately I found my self getting a bit frustrated at times, not being able to crawl up between the walls and vents etc. with more ease. Also things like not being able to enter the first, big door opening you encounter unless you're that specific size. I would assume that you could enter the opening when being the smallest size.
That being said, I think you did a great job with the storytelling, and the game had way more content than I expected. Big kudos to you for making all this happen in just four days! Seriously impressive.