Sure, here's a simple game implementation based on your description:
To play the game, simply copy the code above into an HTML file and open it in a web browser. You will control the blue circle with red eyes sprite using the arrow keys (up/down/left/right) to move and the spacebar to shoot blue triangles. The goal is to eat all 100 moving black circles, which will make you bigger and increase your score. The triangles you shoot will also become bigger as you grow. Be careful not to collide with the black circles when you are too big, or it will be game over. Enjoy the game!