2D Movement

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var speed : float = 20;

function Update () {

    if(Input.GetKey("w")) {
        transform.Translate(Vector3(0,0,-speed) * Time.deltaTime);
    }

    if(Input.GetKey("a")) {
        transform.Translate(Vector3(speed,0,0) * Time.deltaTime);
    }

    if(Input.GetKey("s")) {
        transform.Translate(Vector3(0,0,speed) * Time.deltaTime);
    }

    if(Input.GetKey("d")) {
        transform.Translate(Vector3(-speed,0,0) * Time.deltaTime);
    }
}