This could be so much more dynamic. The puzzles were pretty good!
How about you consider vertical cloud growth, too?
Pretty good overall, it's got a lot of potential.
What could, in another setting, be just another fit-the-pieces-together puzzle game, has become something else: a meditative puzzle game.
The only thing that I can think of that might improve the zen-like aspect of the game would be to let the clouds have a little more "floaty-ness" to them (in terms of the physics). Instead of a hard stop when the controls are released, just let things gently slide to a stop.
But maybe that's not in the character of this version, with its simple cartoon-like graphics. Still, something to consider, perhaps?
Lovely and fresh.
Love the concept and execution. Simple, with quickly growing difficulty. Great game :D