I really love the graphics and the concept :D Kung-fu mouse fighting a cat gang that wants to steal its cheese, hehe. The movements are quite fluid, I really loved hitting cats from above!
One thing that I found quite frustrating is the gameover, it just throws you instantly back to the main menu even before you can notice that a cat is stealing your cheese. It would be great to have some time to see the cat take the last piece of cheese, and maybe have the mouse die of starvation or grief or something :p