Someone has clearly spent a lot of time and money on this game. It's a shame that the controls suck ass so much, because it looks like it could be fun otherwise.
Great fun until about level 15, because every level after that feels samey. You get a technique going (top left corner, blocking and defending your space) and it doesn't get any harder. Far too many balls and lives from this point on. Deliberately killed myself at level 25 or so. Medium and hard badges show up in your profile afterwards.
Very fun game but very easy and short lived. Favourite gun was definitely the hunting rifle - much better than most of the others. Seeing those double headshots gives one pleasure =0)
Not bad - gets a bit repetitive though and I agree that the time between shots seems inconsistent. Good idea about the "save" option too - ie kill a bird and it drops the seed.