The game is feel is cool, it has impact and cute music.
The idea of hitting the falling blocks would be cool, but since the ball is so fast and the delay between swings is pretty long, hitting a block always meant missing the ball for me so I never used it after a while.
Also the controls on the page do not mention that you can control the cat sideways with A/D which is necessary since the automated control is not able to catch the ball all the time.