I thought it was a funny game and could have some promise but there were a couple of things I found annoying. I managed to shoot four or five ufos down but often found that I couldn't hit them when they were high up and by the time they came in to range there wasn't enough time to kill it before it had abducted a cow. One suggestion would be to increase the range but increase the time until being able to throw again. It would mean you could still hit them but you'd have to line up your shots better.
I lasted quite a while and had 10 cows left and then all of a sudden there was 10 ufos and all my cows were gone.
The area was a little bit big, could maybe do with being smaller and more manageable.