I really liked the graphics. The art style you used was really cute and there was a really natural/organic feel to everything you had up there. And as it was, I actually think it did better without being animated at all. To fit the style, though, I think it would have been really cool if there had been a little white or brown outline around the graphics and then a drop shadow behind them. It would have made the graphics look cardboard-y and it would have given you some major bonus points.
It was a shame there were no sound effects or music. Just a little bit of ambient music from the Audio Portal would have done, and even though the sound effects could have gotten repetitive, at least a little 'ding' every time you hit a certain number of points would have livened it up just a little.
As for the gameplay... I really like what you did here. The concept isn't overly original but it's not by any means bad. The powerups you put in worked nicely and spiced up the experience. Perhaps you could have given the objects a principle of momentum, though. They look kind of odd the way they are now. One last thing I'd like to point out is the canvas size is obnoxiously large. Size it down a bit so that it can all fit on the screen at once and I'd have bumped up your score a little bit.