Adding Thrusters through use of a key.

Since like our Speed power-up, we want our player to gain speed; this time, through the use of a key; we will need to create another variable. In our player script add a variable such as:

SerializeField so we can adjust in inspector.

To have our player move at 2.5 times normal speed; when we press the Left Shift key; we just need to add the following code to our player script in the playerMovement() method.