I actually really liked this game, gave me something to do, kept me occupied for a long time, but not long enough to be really boring. It was a easy to medium game, nothing hard, but not too easy. 5/5 Cheers! :)
Personally, I didn't like the game very much. It's a good idea, but's it's just plain too hard. Lighten it up a little. However, since, once I got good at it, I REALLY enjoyed a couple levels, than the rest that I played kind of sucked. I would recommend this game only if you wanted to A) play for 2 minutes, or B) Break your keyboard in anger. 4/5 for the good levels in the beginning.
I love this game. I played it for about 3 hours this morning just to get the hard badge. I love how it uses gravity well, and I love the pure simplicity of the game. You just have to get the balls to the right coloured circles. However, there are obstacles and stuff in your way. I could play this game for a whole day and never et tired of it! 5/5 Cheers! :)