Changing bridge layer logic to Bridge script instead of BasicCharacter. The Bridge was moved from GameLevel to TerrainManager because its more related to terrain.

Terrain/bridge.gd

@@ -0,0 +1,39 @@
+extends TileMapLayer
+class_name Bridge
+
+@export_category("Objects")
+@export var bellow_bridge_area: Area2D
+@export var on_bridge_area: Area2D
+
+
+func _process(_delta: float) -> void:
+	var character_body_bellow_bridge: Node2D = bellow_bridge_area.get_body()
+	var character_body_on_bridge: Node2D = on_bridge_area.get_body()
+	
+	if character_body_bellow_bridge:
+		if bellow_bridge_area.get_character_body_bellow_bridge():
+			character_body_bellow_bridge.set_collision_layer_value(4, false)
+			character_body_bellow_bridge.set_collision_mask_value(4, false)
+			self.z_index = 2
+		else:
+			character_body_bellow_bridge.set_collision_layer_value(4, true)
+			character_body_bellow_bridge.set_collision_mask_value(4, false)
+			self.z_index = 0
+
+	if character_body_on_bridge:
+		if on_bridge_area.get_character_body_on_bridge():
+			character_body_on_bridge.set_collision_layer_value(8, false)
+			character_body_on_bridge.set_collision_mask_value(8, false)
+			character_body_on_bridge.set_collision_layer_value(1, false)
+			character_body_on_bridge.set_collision_mask_value(1, false)
+			character_body_on_bridge.set_collision_layer_value(2, true)
+			character_body_on_bridge.set_collision_mask_value(2, true)
+
+		else:
+			character_body_on_bridge.set_collision_layer_value(8, true)
+			character_body_on_bridge.set_collision_mask_value(8, true)
+			character_body_on_bridge.set_collision_layer_value(1, true)
+			character_body_on_bridge.set_collision_mask_value(1, true)
+			character_body_on_bridge.set_collision_layer_value(2, false)
+			character_body_on_bridge.set_collision_mask_value(2, false)
+