You can take out bigger snakes by boosting in front of them. The bigger the snake, the slower it is to react. As soon as you take the snake out grab those orbs to grow.
If you are big enough you should circle around an opponent to kill them. if you do this, cross over yourself and get the orbs before someone else does.
When you are in a tough spot, make a circle and keep your head inside the circle as long as possible. This allows you to stay alive and may even score a big takedown.
Use the boost wisely. You can boost in front of a big snake, but if you boost in front of a small snake, you may end up boosting past it too fast.