Love the game, it's a great concept and matches the theme completely ! I love that you found the time to add some drama to the ending :) I would have expected to gradually grow the snowball with a lerp of the radius (kinda what's been described below). Also, a nice challenge could be to attach the objects you've rolled up tangentially to the sphere :D Katamari Damacy style ! Overall, very nicely done, loved it :)