Godot simple walk jump

extends CharacterBody2D

const SPEED = 180
const JUMPFORCE = -950
const GRAVITY = 40

func _physics_process(delta):
	if Input.is_action_pressed("right"):
		velocity.x = SPEED
	if Input.is_action_pressed("left"):
		velocity.x = -SPEED
	if Input.is_action_just_pressed("jump") and is_on_floor():
		velocity.y = JUMPFORCE
	
	
	velocity.y += GRAVITY
	move_and_slide()
	
	velocity.x = lerp(velocity.x, 0.0, 0.1)