2D Platformer Motor

using UnityEngine;
using System.Collections;

public class Player_Motor : MonoBehaviour {

    public static Player_Motor Instance;


    public float verticalVelocity { get; set; }

    public float horizontalVelocity { get; set; }

    public float verticalForce = 6f;

    public float horizontalForce = 6f;

    public float drag = 2.0f;

    public Vector3 moveVector { get; set; }

    public Transform _Cam;

    float gravity = 21.8f;

    float terminalVelocity = 20.0f;

    void Awake() {
        Instance = this;
    }

    public void UpdateMotor () {
        ProcessMotion ();

        Debug.Log (moveVector);

        _Cam.transform.position = new Vector3 (transform.position.x, transform.position.y, _Cam.transform.position.z);
    }

    void ProcessMotion() {
        moveVector = transform.TransformDirection (moveVector);

        if (moveVector.magnitude > 1) {
            moveVector = Vector3.Normalize(moveVector);
        }

        horizontalVelocity = horizontalForce;

        moveVector = new Vector3 (horizontalVelocity, verticalVelocity, 0);

        applyDrag();

        applyGravity();

        Player_Controller.characterController.Move (moveVector * Time.deltaTime);
    }

    void applyDrag() {

        if (moveVector.x > 0) {
            moveVector = new Vector3(horizontalVelocity - drag * Time.deltaTime, moveVector.y, 0);
        }
    }

    void applyGravity() {
        if (moveVector.y > -terminalVelocity) {
            moveVector = new Vector3(moveVector.x, moveVector.y - gravity * Time.deltaTime, 0);
        }

        if (Player_Controller.characterController.isGrounded && moveVector.y < -1) {
            moveVector = new Vector3 (moveVector.x, -1, 0);
        }
    }

    public void Leap() {
        //if (Player_Controller.characterController.isGrounded ) {
        verticalVelocity = verticalForce;
        //}
    }

}