Very cool idea with a lot of potential! The animations of scaling are well made although I wish they would take less time (especially the animation of going into space - sometimes you have to do it multiple times in a row, which can get tideous). Alternative idea would be to somehow apply the effect of changing the state of the sun and the moon in the same order you changed them (what I mean is if the player moved the moon closer and after that moved the sun far away he would come back to see the water rise and only after that get frozen). It probably wouldn't benefit the game artistically, but it would save the player from having to go in-and-out multiple times.
The mini-puzzle levels inside the buckets are also really fun. Great job!