This is nice simple to play game. Great job!

The score is not set to zero after you loose a game.
Also it is a little bit confusing, that you first must press x to start and then o to select a difficulty.

also it should increase the difficulty, when more flowers are picked up. for example give the bee a speed up

local xx,yy= xbee - xplayer, ybee - yplayer
if xx*xx+yy*yy > 10*10 then -- bee is more than 10 pixels away
  s--peedup bee
end

or/and add more bees. But then you should variate the target of the bees. for example move to the flower, mover to the player, move to a random place and switch the target, when the bee reach the position. Most time the player of course.

Also the bee is a little bit hard to see. maybe a dark color on the green field is better and maybe a Tail should be added.