Make a flower, to represent the player, and surround it in a bubble, which is about twice the size of the flower. Let the bubbled flower roam the screen randomly. Put a bunch of other bubbles on the screen, that also move around randomly. The player uses the mouse, with a drag and drop function, to move the other bubbles away from the bubbled flower, before one of those bubbles touches it. If the bubbled flower gets touched, it wilts, and you lose a life. Lose three lives and it's game over. Survive long enough, and the flower gets emboldened, which means it's bubble gets bigger. Now we move on to next level, with more attacking bubbles and so forth and so on.
Ah, let's see, what to call it??? Hmmm, I know! Welcome to Personal Space Invaders!
Pete :D