Very cool look to the game. The occasional sounds when the bees appeared made me feel like that the bees were a normal part of life that I had to accept.
I agree with the BagelMaster that the bullets travel too slow, and that it is near impossible to defeat a bee once it has started flying away with a plant.
Also I could not figure out how to go to a next level. Do I need to save all the plants to do that? I kept getting a Game Over screen when the time/bonus score ran out.