If the desired effect was to create a relaxing and satisfying puzzle game, then you have achieved that superbly!
It wasn't too challenging, but just enough so that when i figured out the solution to each level, it was rewarding in a way that only puzzle games (and untangling fishing lines) can be. The puzzles are made in such a way that the solutions are always elegant - albeit in varying degrees - and rewardingly aesthetic.
Apart from being a little too short, the only gripe i have (and it is a small one) is that the physics were perhaps a teency weency bit rough - so that when the bulbs were stationary they jiggled a little crazily, which only 'once' led to me just missing one bulb that needed lighting up.
Overall, i would say a well made game. A good, original concept, smoothly executed. I'd love to see more levels and more mechanisms added in perhaps a sequel... It's a reasonably fresh idea, so there's lots to explore. A short-fused bulb that shuts lighted ones down again, or a heavier bulb that shatters others when it lands on them from a height, are a couple of examples of ideas you could explore. I'm sure there's lots more.
I liked the music too, although it was a bit short and i did turn it off just before i got all the way through. And i could swear i've heard it somewhere before - i'm thinking on a Tommy Emmanuel cd... In any case it was perfect for the atmosphere of the game and was, i thought, the proverbial icing on the imaginary cake.
Top stuff, mate!
...mmm i really want cake now.