add tooltip on enemies, update enemy type on merge

scripts/Enemy.gd

@@ -46,6 +46,7 @@ var is_upgrading: bool = false
 
 @onready var mesh_node: MeshInstance3D = $BodyMesh
 var mat: StandardMaterial3D
+var type_label: Label3D
 
 var COLOR_CHASE = Color(1.0, 0.28, 0.18)
 var COLOR_FLY   = Color(1.0, 0.85, 0.1)
@@ -59,6 +60,21 @@ func _ready() -> void:
 	mat = mesh_node.material_override.duplicate() as StandardMaterial3D
 	mesh_node.material_override = mat
 	COLOR_CHASE = mat.albedo_color
+	type_label = Label3D.new()
+	type_label.billboard = BaseMaterial3D.BILLBOARD_ENABLED
+	type_label.position = Vector3(0, 1.6, 0)
+	type_label.font_size = 28
+	type_label.outline_size = 5
+	type_label.modulate = Color.WHITE
+	add_child(type_label)
+
+func _update_label() -> void:
+	if type_label == null:
+		return
+	var stars := ""
+	for i in range(enemy_level - 1):
+		stars += "★"
+	type_label.text = enemy_type + (" " + stars if stars != "" else "")
 
 func setup(type: String, wave: int) -> void:
 	enemy_type = type
@@ -93,6 +109,7 @@ func setup(type: String, wave: int) -> void:
 			enemy_level = 3
 	kick_tier = enemy_level
 	toughness_tier = enemy_level
+	_update_label()
 
 func _physics_process(delta: float) -> void:
 	match state:
@@ -290,9 +307,15 @@ func _start_merge(other: Node) -> void:
 	tw.tween_property(other, "global_position", global_position, 0.2)
 	tw.tween_callback(_on_merge_complete)
 
+static func _next_enemy_type(current: String) -> String:
+	match current:
+		"slime": return "bat"
+		"bat":   return "ogre"
+		_:       return "titan"
+
 func _on_merge_complete() -> void:
 	var merge_pos := global_position
-	var merge_type := enemy_type
+	var merge_type := _next_enemy_type(enemy_type)
 	var new_level: int = enemy_level + 1
 	var new_wave: int = wave_num
 	if is_instance_valid(merge_partner):