Use WASD or arrow keys to move. Press p to pause. Eat objects smaller than you to grow, but avoid larger objects, as they will make you shrink! Shrink too much and it's game over! If an object starts changing colors, it means you have just become big enough to eat it. You can also view 'The Menu', which describes all of the things that Pico has eaten. all the particles vanished!
remember to turn WIFI on! the particles have vanished (or have they?)