godot, particle emitting

player.gd

extends RigidBody3D
##how much vertical force
@export_range(750.0, 3000.0) var thrust: float = 1000.0
##how much horizntal force
@export var torque: float = 100.0
@onready var audio: AudioStreamPlayer = $Audio
@onready var audio_success: AudioStreamPlayer = $Audio_success
@onready var audio_rocket: AudioStreamPlayer3D = $Audio_rocket
@onready var booster_particles: GPUParticles3D = $BoosterParticles
@onready var explosion_particles: GPUParticles3D = $ExplosionParticles

var next_level: String

var is_transitioning: bool = false
# Called every frame. 'delta' is the elapsed time since the previous frame.
func _physics_process(delta: float) -> void:
	if Input.is_action_pressed("boost"):
		apply_central_force(basis.y * delta * thrust)
		if audio_rocket.playing == false:
			audio_rocket.play()
			booster_particles.emitting = true
	else:
		audio_rocket.stop()
		booster_particles.emitting = false
		
	if Input.is_action_pressed("left"):
		apply_torque(Vector3(0.0, 0.0, torque * delta))
	if Input.is_action_pressed("right"):
		apply_torque(Vector3(0.0, 0.0, -torque * delta))
		
		
func crash_sequence() -> void:
	print("Kaboom")
	explosion_particles.emitting = true
	audio.play()
	set_process(false)
	is_transitioning = true
	var tween = create_tween()
	tween.tween_interval(2.5)
	tween.tween_callback(get_tree().reload_current_scene)
	

func complete_level(next_level_file: String) -> void:
	set_process(false)
	audio_success.play()
	is_transitioning = true
	var tween =create_tween()
	tween.tween_interval(2.5)
	next_level = next_level_file
	tween.tween_callback(go_to_next)#get_tree().reload_current_scene)
	print("You Win")
	#get_tree().call_deferred("change_scene_to_file", next_level_file)
func go_to_next() -> void:
	get_tree().call_deferred("change_scene_to_file", next_level)

func _on_body_entered(body: Node) -> void:
	if is_transitioning == false:
		if "Goal" in body.get_groups():
			complete_level(body.file_path)
		if "Hazard" in body.get_groups():
			crash_sequence()