I never would have thought of division as fun..
Pretty interesting idea ya got here. I never would have thought that 4th grade division could be so fun xD
However, a couple problems..
1) A couple times, when the cogs hit the side of the paddle (not right on the edge, but close) the cog would just fall through anyways.
2) Sometimes when a cog hit the paddle it would divide it twice instead of once. Given this is more of a benefit, but it takes away from the gameplay.
3) Make the screen a bit bigger. Sometimes the cogs got a little too jumbled, which made me make a few too many mistakes xP
4) This game can become a bit slow. I made it to level 14 and I didnt have many problems (but I accidently missed a few cogs so I didnt get further). I would love to see a RIDICULOUS gameplay mode where 5 or more cogs are dropping all together (but if ya do that, make sure ya make the screen much bigger).
Also, market this game to elemetary schools so that kids can learn mental math and division, all while playing a videogame xD hahaha! It could be a big hit!
Anywho, very original and interesting idea. Work on those couple things, and this would be amazing :D