A fun and well-polished little game.
Audio is great, controls are solid, art is adorable (and good job handling the upscaling/changing texture on the yarn ball).
My only complaint would be that as the ball gets really big, it kinda lacks some of the feeling of weight that you would expect to come with it. Maybe pitch down the collision noise it makes and make it harder to push the bigger it gets?
Overall, really good job - looking forward to seeing what this looks like when it gets more than a sandbox mode! (And sorry for the multiple comment posts - my browser went haywire!)