added the game

Scripts/Classes/Entities/Enemies/Boo.gd

@@ -0,0 +1,52 @@
+extends Node2D
+
+var target_player: Player = null
+
+var velocity := Vector2.ZERO
+
+const MOVE_SPEED := 30
+const SMOKE_PARTICLE = preload("uid://d08nv4qtfouv1")
+var direction := -1
+
+signal killed
+
+func _physics_process(delta: float) -> void:
+	target_player = get_tree().get_first_node_in_group("Players")
+	if $TrackJoint.is_attached == false:
+		handle_movement(delta)
+	$Sprite.scale.x = direction
+
+func handle_movement(delta: float) -> void:
+	var target_direction = sign(target_player.global_position.x - global_position.x)
+	if target_direction != 0:
+		direction = target_direction
+	if target_player.direction == direction:
+		if $Sprite.animation != "Move":
+			$Sprite.play("Move")
+		velocity = lerp(velocity, 30 * global_position.direction_to(target_player.global_position), delta * 5)
+	else:
+		if $Sprite.animation != "Idle":
+			$Sprite.play("Idle")
+		velocity = lerp(velocity, Vector2.ZERO, delta * 5)
+	global_position += velocity * delta
+
+
+func on_area_entered(area: Area2D) -> void:
+	if area.owner is Player:
+		if area.owner.is_invincible:
+			die()
+		else:
+			area.owner.damage()
+
+func die() -> void:
+	summon_smoke_particle()
+	queue_free()
+	killed.emit()
+
+func flag_die() -> void:
+	die()
+
+func summon_smoke_particle() -> void:
+	var particle = SMOKE_PARTICLE.instantiate()
+	particle.global_position = global_position
+	add_sibling(particle)