I feel like it'd be more fun as a "spammy" type of game. Currently, the time it takes to fade to color your thing and fade again to see the tree is longer than the crafting itself.
Perhaps if the tree was inside, and the balls went on it right away with the colors automatically randomized. Then each decoration gradually requires more scores to craft. The game would feel less dragged out and become a competition of "I TURNED MY TREE INTO GRAPES."