Jeu Chiant contains no story, no baddies, no levels, no bosses, just frantic mouse-work and multitasking. None of the 2 balls must fall, and the small one needs to be kept above the level of the top paddle. Keep both balls up for as long as you can!
The despair of seeing one of your balls fly into oblivion is compounded by the snarky assessments of your efforts, which are on the one hand entirely uncalled for, and on the other hand basically true (press the little British flag in the lower left if you wish to be insulted in English).