Very Hard and Not Fun
It is very hard to hit the animals. Even with spam click, you have about fifty percent chance to hit the target. Doing well in this game has requires some skill and mostly luck.
It would be nice to see different challenge levels. How about a way to power up your shots? A slow down power up would really help.
If every review complains about "hit box ", maybe you should adjust it. Constructive criticism can only help you as a programmer.