diff --git a/game/game.gd b/game/game.gd
index 696d604..ef9f3ce 100644
--- a/game/game.gd
+++ b/game/game.gd
@@ -89,6 +89,7 @@ func update_counter_icon():
 		store_collector_texturerect.texture = null
 
 func _on_ghost_requested(item: PurchasableItem):
+	print("[Game] Requested ghost for: ", item)
 	ghost.COMPAT_set_to_purchasable_item(item)
 	ghost.process_mode = Node.PROCESS_MODE_INHERIT
 	ghost.show()
diff --git a/interface/ghost/ghost.gd b/interface/ghost/ghost.gd
index 2c407c9..2430625 100644
--- a/interface/ghost/ghost.gd
+++ b/interface/ghost/ghost.gd
@@ -57,17 +57,23 @@ func _ready():
 
 ## Update the value of [can_place].
 func update_state():
+	overlap_checker.update_is_overlapping_with()
+	placeable_area_checker.update_is_overlapping_with()
 	# DIRTY HACK: Relies on the placeable area being perfectly surrounded by solid bodies.
 	can_place = overlap_checker.is_overlapping_with == null and placeable_area_checker.is_overlapping_with != null
 
 ## For retro-compatibility, configure this for the placement of a [PurchasableItem].
 func COMPAT_set_to_purchasable_item(pi: PurchasableItem):
+	push_warning("COMPAT_set_to_purchasable_item is deprecated.")
 	instantiator.scene_to_instantiate = pi.item_scene
-	placement_shape.shape = pi.get_node("ConverterPlacementBody").get_node("FullConverterShape").shape
-	placement_shape.scale = pi.item_scene.scale
+	var item_scene = pi.item_scene.instantiate()
+	placement_shape.shape = item_scene.get_node("ConverterPlacementBody/FullConverterShape").shape
+	placement_shape.scale = item_scene.scale
+	item_scene.queue_free()
 	preview_sprite.texture = pi.item_icon
 	position = starting_position
 	rotation = starting_rotation_radians
+	update_state()
 
 
 ## Configure this for the placement of a [ShopItem].
@@ -78,6 +84,7 @@ func set_to_shop_item(si: ShopItem):
 	preview_sprite.texture = si.placement_texture
 	position = starting_position
 	rotation = starting_rotation_radians
+	update_state()
 
 ## Emitted when [materialize] is called.
 signal materialized(what: Node)
@@ -88,7 +95,16 @@ signal materialized(what: Node)
 func materialize() -> Node:
 	if not can_place:
 		return null
+	overlap_freer.update_is_overlapping_with()
 	overlap_freer.area_queue_free()
 	var inst = instantiator.instantiate()
 	materialized.emit(inst)
 	return inst
+
+
+func _on_moved(_from, _to):
+	update_state()
+
+
+func _on_rotated_radians(_from, _to):
+	update_state()
diff --git a/interface/ghost/ghost.tscn b/interface/ghost/ghost.tscn
index dbb4e25..aa95989 100644
--- a/interface/ghost/ghost.tscn
+++ b/interface/ghost/ghost.tscn
@@ -26,13 +26,17 @@ z_index = 10
 [node name="Instantiator" parent="." instance=ExtResource("4_f7fmh")]
 
 [node name="OverlapChecker" parent="." instance=ExtResource("5_twds7")]
-
-[node name="OverlapFreer" parent="." instance=ExtResource("6_y1rxa")]
+overlap_mask = 8
 
 [node name="PlaceableAreaChecker" parent="." instance=ExtResource("7_wemqm")]
+overlap_mask = 16
+
+[node name="OverlapFreer" parent="." instance=ExtResource("6_y1rxa")]
+overlap_mask = 4
 
 [connection signal="area_entered" from="." to="PlaceableAreaChecker" method="update_is_overlapping_with"]
 [connection signal="area_exited" from="." to="PlaceableAreaChecker" method="update_is_overlapping_with"]
 [connection signal="body_entered" from="." to="OverlapChecker" method="update_is_overlapping_with"]
 [connection signal="body_exited" from="." to="OverlapChecker" method="update_is_overlapping_with"]
-[connection signal="overlap_changing" from="OverlapChecker" to="." method="update_state"]
+[connection signal="moved" from="PreciseTouchPlacer" to="." method="_on_moved"]
+[connection signal="rotated_radians" from="PreciseTouchPlacer" to="." method="_on_rotated_radians"]
diff --git a/interface/ghost/overlap_checker.gd b/interface/ghost/overlap_checker.gd
index c05a8ef..f735995 100644
--- a/interface/ghost/overlap_checker.gd
+++ b/interface/ghost/overlap_checker.gd
@@ -34,6 +34,7 @@ func get_first_overlapping_body() -> Node2D:
 func update_is_overlapping_with() -> void:
 	var current_overlap = get_first_overlapping_body()
 	if current_overlap != is_overlapping_with:
+		print("[OverlapChecker] Now overlapping with: ", current_overlap)
 		overlap_changing.emit(current_overlap)
 	is_overlapping_with = current_overlap
 
diff --git a/interface/ghost/placeable_area_checker.gd b/interface/ghost/placeable_area_checker.gd
index f06d750..f318da4 100644
--- a/interface/ghost/placeable_area_checker.gd
+++ b/interface/ghost/placeable_area_checker.gd
@@ -29,5 +29,6 @@ signal overlap_changing(to: PlaceableArea)
 func update_is_overlapping_with() -> void:
 	var current_overlap = get_first_overlapping_placeable_area()
 	if current_overlap != is_overlapping_with:
+		print("[PlaceableAreaChecker] Now overlapping with: ", current_overlap)
 		overlap_changing.emit(current_overlap)
 	is_overlapping_with = current_overlap
diff --git a/interface/ghost/precise_touch_placer.gd b/interface/ghost/precise_touch_placer.gd
index de0e8e3..9264333 100644
--- a/interface/ghost/precise_touch_placer.gd
+++ b/interface/ghost/precise_touch_placer.gd
@@ -26,6 +26,10 @@ var last_touch_events: Array[InputEvent] = [
 ]
 
 
+signal moved(from: Vector2, to: Vector2)
+signal rotated_radians(from: float, to: float)
+
+
 ## Count the number of non-[null] [last_touch_events].
 func count_active_touch_events() -> int:
 	var total = 0
@@ -43,12 +47,18 @@ func _input(event: InputEvent):
 	if count == 0:
 		# Mouse drag
 		if event is InputEventMouseMotion and last_mouse_event:
+			var from = target.position
 			target.position += event.relative
+			var to = target.position
+			moved.emit(from, to)
 	# Touch drag
 	elif count == 1:
 		# Touch drag
 		if event is InputEventScreenDrag:
+			var from = target.position
 			target.position += event.relative
+			var to = target.position
+			moved.emit(from, to)
 	# Handle rotation
 	elif count == 2:
 		# Find the previous event
@@ -77,7 +87,10 @@ func _input(event: InputEvent):
 		# Find the angle between the two vectors
 		var rotation_radians = previous_vec.angle_to(current_vec)
 		# Apply the rotation
-		target.rotation += rotation_radians	
+		var from = target.rotation
+		target.rotation += rotation_radians
+		var to = target.rotation
+		rotated_radians.emit(from, to)	
 
 	# Store last events
 	if event is InputEventMouseButton:
diff --git a/interface/purchasable_item.gd b/interface/purchasable_item.gd
index 1d326ab..ac10bd2 100644
--- a/interface/purchasable_item.gd
+++ b/interface/purchasable_item.gd
@@ -90,25 +90,25 @@ var has_bought: bool:
 
 
 ## Emitted when a purchase has started.
-signal purchase_begin(what: PurchasableItem)
+signal purchase_begin
 
 ## Emitted when a purchase is cancelled.
-signal purchase_cancel(what: PurchasableItem)
+signal purchase_cancel
 
 ## Emitted when a purchase is completed.
 ##
 ## Emitted by complete_purchase().
-signal purchase_success(what: PurchasableItem)
+signal purchase_success
 
 
 func _on_buy_button_pressed():
 	if is_buying:
 		is_buying = false
-		purchase_cancel.emit(self)
+		purchase_cancel.emit()
 	else:
 		is_buying = true
-		purchase_begin.emit(self)
+		purchase_begin.emit()
 
 func complete_purchase():
 	is_buying = false
-	purchase_success.emit(self)
+	purchase_success.emit()
diff --git a/interface/score_ui.gd b/interface/score_ui.gd
index 131effe..b9d8232 100644
--- a/interface/score_ui.gd
+++ b/interface/score_ui.gd
@@ -10,6 +10,16 @@ class_name ScoreUI
 @onready var request: HTTPRequest = $SubmissionRequest
 
 
+@onready var parent: Node = get_parent()
+
+
+func _ready():
+	if parent is SafeUI:
+		parent.process_mode = PROCESS_MODE_DISABLED
+	else:
+		process_mode = PROCESS_MODE_DISABLED
+
+
 func _on_game_score_changed(total: int):
 	score_button.set_score(total)
 
diff --git a/interface/shop_ui.gd b/interface/shop_ui.gd
index 45cf411..2f621d2 100644
--- a/interface/shop_ui.gd
+++ b/interface/shop_ui.gd
@@ -21,39 +21,41 @@ signal purchase_cancel(what: PurchasableItem)
 signal purchase_success(what: PurchasableItem)
 
 ## Array of all PurchasableItems that this ShopUI should control.
-@onready var purchasable_items: Array[Node] = find_children("*", "PurchasableItem")
+var purchasable_items: Array[Node] = []
 
 signal ghost_requested(what: PurchasableItem)
 
 
-func _ready():
-	for item in purchasable_items:
-		item.purchase_begin.connect(_on_any_purchase_begin)
-		item.purchase_cancel.connect(_on_any_purchase_cancel)
-		item.purchase_success.connect(_on_any_purchase_success)
+@onready var parent: Node = get_parent()
 
-func _on_any_purchase_begin(what: Node):
-	if not what is PurchasableItem:
-		push_error("Purchase began outside a PurchasableItem")
-		return
+
+func _ready():
+	purchasable_items = find_children("*", "PurchasableItem", true, false)
+	for item in purchasable_items:
+		item.purchase_begin.connect(_on_any_purchase_begin.bind(item))
+		item.purchase_cancel.connect(_on_any_purchase_cancel.bind(item))
+		item.purchase_success.connect(_on_any_purchase_success.bind(item))
+	if parent is SafeUI:
+		parent.process_mode = PROCESS_MODE_DISABLED
+	else:
+		process_mode = PROCESS_MODE_DISABLED
+
+func _on_any_purchase_begin(what: PurchasableItem):
+	print("[ShopUI] Beginning purchase of: ", what)
 	delete_button.disabled = true
 	if what.item_scene:
 		ghost_requested.emit(what)
 	purchase_begin.emit(what)
 	set_all_can_buy(false, what)
 
-func _on_any_purchase_cancel(what: Node):
-	if not what is PurchasableItem:
-		push_error("Purchase cancelled outside a PurchasableItem")
-		return
+func _on_any_purchase_cancel(what: PurchasableItem):
+	print("[ShopUI] Cancelling purchase of: ", what)
 	delete_button.disabled = false
 	purchase_cancel.emit(what)
 	set_all_can_buy(true, what)
 
-func _on_any_purchase_success(what: Node):
-	if not what is PurchasableItem:
-		push_error("Purchase succeeded outside a PurchasableItem")
-		return
+func _on_any_purchase_success(what: PurchasableItem):
+	print("[ShopUI] Succeeded purchase of: ", what)
 	if what.item_scene:
 		ghost_materialize.emit()
 	delete_button.disabled = false
diff --git a/main.tscn b/main.tscn
index fc5bcee..8266061 100644
--- a/main.tscn
+++ b/main.tscn
@@ -72,7 +72,7 @@ apply_margin_top = true
 layout_mode = 2
 
 [node name="ShopSafeUI" parent="CustomUI" instance=ExtResource("5_2uxda")]
-process_mode = 4
+process_mode = 3
 visible = false
 layout_mode = 1
 apply_margin_left = true
@@ -84,7 +84,6 @@ apply_margin_bottom = true
 layout_mode = 2
 
 [node name="ScoreSafeUI" parent="CustomUI" instance=ExtResource("5_2uxda")]
-process_mode = 4
 visible = false
 layout_mode = 1
 apply_margin_left = true