The purpose of the game is to catch as many eggs as possible using the brown basket on the screen and transform them into points. Each egg that you manage to catch will add one point to your score. You also have 12 lives, meaning that you are allowed to miss 12 eggs before the game is over.
In order to move the basket you first have to grab hold of it. You can do this at the beginning or during a game by clicking with your mouse on the basket. Now you can move it in four directions using these keys: W (up), S (down), A (left), D (right).
If you prefer to play this game in a silent environment you can uncheck the Sound option in the lower left of the screen. Good luck and have fun!