TUISHIMI  Gross! :) Well I downloaded it and tried in free mode. The flyswatter would be welcomed. It's not for me, but it is grossly "cute."

One thing that "bugged" me was the sound loop. Should probably be mixed up a little with other sounds and a less conspicuous loop.

A cool feature to add would be to have the screen be more like a camera lens and allow the flys to land on it (bottoms of flies facing you on the screen, and larger as if they are closer).  
(Version 1.1.2)