Beat 'em up jump mechanic tutorial

extends KinematicBody2D

var MAX_SPEED = 100
var ACCELERATION = 500
var JUMP_SPEED = 25
var GRAVITY = 5

var motion= Vector2()

var z = 0

var jumpMultiplyer = 8

var Jumping = false


func _physics_process(delta):
    var axis = get_input_axis()
    print(Jumping)
    if axis == Vector2.ZERO:
        if  Jumping == false:
            $AnimationPlayer.play("Idle")
        apply_friction(ACCELERATION * delta)
    else:
        if  Jumping == false:
            $AnimationPlayer.play("Run")
        apply_movement(axis * ACCELERATION * delta)

    if global_position.y < 129.693 and Jumping == false:
        motion.y = 0
        if axis.y > 0:
            apply_movement(axis * ACCELERATION * delta)

    if Input.is_action_just_pressed("jump") and Jumping == false:
        $AnimationPlayer.play("Jump")
        Jumping = true
        z += -JUMP_SPEED * jumpMultiplyer

    if z > 25 * jumpMultiplyer:
        Jumping = false
        z = 0
        motion.y = 0


    if Jumping == true:
        z += GRAVITY
        motion.y = z

    motion = move_and_slide(motion)



func get_input_axis():
    var axis = Vector2.ZERO
    axis.x = int(Input.is_action_pressed("ui_right")) - int(Input.is_action_pressed("ui_left"))
    axis.y = int(Input.is_action_pressed("ui_down")) - int(Input.is_action_pressed("ui_up"))

    if axis.x > 0:
        $Sprite.flip_h = false
    elif axis.x < 0:
        $Sprite.flip_h = true

    return axis.normalized()

func apply_friction(amount):
    if motion.length() > amount:
        motion -= motion.normalized() * amount
    else:
        motion = Vector2.ZERO

func apply_movement(accel):
    motion += accel
    motion = motion.clamped(MAX_SPEED)