In Drift Boss, you won't be able to change how fast the car drifts. Instead, pay attention to when you press and let go of the keys. The car will move to the right every time you hold down the key. If not, let go of your hand and let the thing go back to the way it was moving. If the car goes off the main road, the round is over. The distance you travel and the number of coins you gather are used to figure out how well you did.