Nice, this is very short and sweet! That's a really cool mechanic, and you really must explore it further. Those five+ levels showed some possibilities, but never put them into any particularly interesting scenarios. We need more blocks, more complex levels, and interesting puzzles! I quite liked the level where you had to use a block and a wind current to push the block up into the goal! My main criticism towards the game is that you can't tell which way the wind is going. You might want to add some animation or some other indication to show which way blocks will be pushed. It was also annoying going back out to the menu after each level, it'd be nicer if completing a level brought you straight to the next one. This was a really nice puzzle game, I like the art and the mechanic is very innovative!