Really cool game, simple concept. I suck at playing it though, my current record is 7 flies.
I like the tune and simple but effective titlescreen.
The only thing I feel a little too harsh is the score going back to zero. maybe could be more motivating give extra points for streaks instead to punish the player. Also maybe instead of three lives it could have some sort of energy bar that goes down when you miss a fly, but goes up when you catch one (or another number of) flies, to make every play a little longer.