Controls:

Arrow Keys or lead with mouse - Movement

Speed Boosting - You can either click and hold the right or left mouse button, hold the up arrow or the space button to generate a burst of speed (in mobile edition, you have to double-tap your screen). This makes your snake move significantly faster than usual at the cost of shedding 15 of your current length per second. However, the amount of length shed remains constant, meaning that the larger your snake is, the less significant this loss of length is. However, when using the speed boost, it can be harder to control your snake precisely and you'll have less time to react to the movements of other nearby snakes.