I didn't know I have to remove the gravity from the previous selected object and ther was no feedback for that so the controls were sometimes confusing. Other than that I like the idea and the levels.

Pretty much what Dolpenguin wrote in the game's comment section; basically stole the words out of my mouth.
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Love the idea.  I think it has a lot of potential for more puzzles.

Regarding controls, I think the game could benefit from automatically removing gravity from the previous object that had it.  This could fundamentally change the way the game is played though, as a fast-moving object won't be difficult to deal with when you can stop it falling by clicking another object.  That could be a good or bad thing, depending on the intent of the design.

Good work.

Good puzzle design, and props for creating so many levels out of one original idea!

The game has a lot of potential, and it could really use some indicator of what object currently has gravity.

Some neat physics here, GJ and great game.