It was free for me... too bad.
Anyways, I wouldn't buy it yet. First, because it's just an exact clone of a free online flash game, second because it's just not fun. In the bird hunt, the most promising of the three modes, all you have to do is fire straight up rapidly to shoot every single bird with ease. In the other modes, all you're doing is firing at the same spot a few times until you kill your opponent. Setting the power is useless, you're always going to want it at 100 as you'll do more damage that way and you can get all the precision you want just by adjusting angle. Finally, since there are little labels telling you what your power and angle are at, you can get the exact number every time so you'll always hit. There's no variables except possibly someone bumping you just as you release your arrow.
/rant
Nate