Simple but entertaining!
This is a good example of how a simple idea can be turned into an interesting game by twisting the concept a little bit.
Imagine shooting balloons with arrows - it's borderline boring. But throw in a bazooka and some drooling zombies with hilarious sound-effects and you're spot on! Extra points for the flying body parts! :D
If you are to make a sequel for this game (which I hope you will) I suggest you implement more of those cool trick shot levels in it - they we're really fun! It's really rewarding to hit a zombie right in the face from an awkard position :D
All it really needs is more levels, and that just goes to show how addicting this game is. Well done!