I really like the concept of this game. Like someone said, it could make for a wonderful little mobile game. The camera movement needs some work, as things change rotation when I hold them and the camera starts moving. Also I'd love to have R to restart and Spacebar to go to the next level. Having to use the mouse means I need to click and then move back to the things that need grabbing, which wastes precious fractions of a second I could use to better align the objects.
But yeah, over all I like it a lot and it could be a really nice mobile game or online game. Well done :)