Hmm...
Good puzzles, but VERY difficult to pull off what you need to do. I doubt anyone could beat level 3 in under seven seconds (Silver medal) in a reasonable amount of time. I couldn't do it after about 100 tries... it's too pixel perfect. The objects move too much at the slightest bump, making some medals/levels nearly impossible. The physics are odd... Try grabbing the bottom of a vertical board and pulling down - Not what you would normally expect, right? To top it all off, sometimes the game doesn't recognize when a box is in the green, and I have to mess around a LOT before it accepts it. It seems like the gameplay stays pretty much the same, too... for example, I've only seen target areas for green boxes. Why not green and red boxes? Or blue wheels?
I'm forgetting something, but I'm tired and a little sick, so... I'll shut up now. (That sounds horrible.)