LD56 is over. This is the game.

addons/godot_debug_environments/inspector.gd

@@ -0,0 +1,38 @@
+@tool
+class_name DebugEnvironmentInspector extends EditorInspectorPlugin
+
+var current_scene:Node
+
+func _can_handle(object:Object)->bool:
+	return object is Node and object == EditorInterface.get_edited_scene_root()
+
+func _parse_begin(object:Object)->void:
+	current_scene = object as Node
+	add_custom_control(create_ui(object as Node))
+
+func create_ui(object:Node)->Control:
+	var root := VBoxContainer.new()
+	var header : = HBoxContainer.new()
+	root.add_child(header)
+	var icon := TextureRect.new()
+	header.add_child(icon)
+	icon.texture = load("res://addons/godot_debug_environments/flask.svg") as Texture2D
+	var title := Label.new()
+	header.add_child(title)
+	title.size_flags_vertical = Control.SIZE_EXPAND_FILL
+	title.text = "Select testing scene"
+	var scene_picker := EditorResourcePicker.new()
+	root.add_child(scene_picker)
+	scene_picker.base_type = "PackedScene"
+	var data := LinkData.new()
+	if data.has_link(current_scene.scene_file_path):
+		var scene_path := data.get_link(current_scene.scene_file_path)
+		scene_picker.edited_resource = ResourceLoader.load(scene_path)
+	scene_picker.connect("resource_changed",on_scene_selected)
+	return root
+
+func on_scene_selected(resource:Resource)->void:
+	var current_scene_path := current_scene.scene_file_path
+	var target_scene_path := resource.resource_path
+	var data := LinkData.new()
+	data.save_scene_link(current_scene_path, target_scene_path)