My Releasing and Unreleasing animations are not working

Question

extends KinematicBody2D

var velocity = Vector2()
const SPEED = 30
const GRAVITY = 7
const FLOOR = Vector2(0, -1)
const JUMP_POWER = -150

var onground = false
var gunactivated = false

func physicsprocess(delta):

if Input.is_action_pressed("release"):
    if gun_activated == false:
        gun_activated = true
        $AnimatedSprite.play("re")
elif Input.is_action_pressed("unrelease"):
    if gun_activated == true:
        gun_activated = false

if Input.is_action_pressed("ui_right"):
    velocity.x = SPEED
    $AnimatedSprite.play("Run")
    $AnimatedSprite.flip_h = false
elif Input.is_action_pressed("ui_left"):
    velocity.x = -SPEED
    $AnimatedSprite.play("Run")
    $AnimatedSprite.flip_h = true
else:
    velocity.x = 0
    if on_ground == true:
        $AnimatedSprite.play("idle")

if Input.is_action_pressed("ui_up") || Input.is_action_pressed("Jump"):
    if on_ground == true:
        velocity.y = JUMP_POWER
        on_ground = false

velocity.y += GRAVITY

if is_on_floor():
    on_ground = true
else:
    on_ground = false
    if velocity.y < 0:
        $AnimatedSprite.play("Jump")
    else:
        $AnimatedSprite.play("Fall")

velocity = move_and_slide(velocity, FLOOR)