Refactored a bit. Created 'Level' class; added UI to each level.

scripts/game_controller.gd

@@ -1,30 +1,46 @@
 extends Node2D
-
-var coins_collected : int = 0
-var total_coins : int = 0
-var levels = ["res://scenes/level_1.tscn", "res://scenes/level_2.tscn", "res://scenes/level_3.tscn"]
-var timers = [10, 15, 20]
-var time_available : int = 0
-var current_level = 0
-var timer = Timer.new()
+## Autoload GameController object for handling game logic
 
 ## Signals
-signal level_changed(level)
-signal destroyed(body)
-signal player_damaged(health, max_health)
-signal player_death
+# Save/load
 signal game_loaded(stashed_data)
 signal game_saved(level, time_remaining, player_health, enemies_dictionary)
-signal timer_updated(time_remaining)
+# Player health
+signal player_damaged(health, max_health)
+signal player_death
+# Other
 signal coin_collected(coins_remaining)
+signal destroyed(body)
+signal level_changed(level)
+signal timer_updated(time_remaining)
 
+## Member variables
+# Coins
+var coins_collected : int = 0
+var total_coins : int = 0
+# Levels
+var level_names : Array = DirAccess.open("res://scenes/levels").get_files()
+var levels : Array
+var current_level = 0
+# Save/load
+var stash_data : Dictionary = {}
+# Timers
+var timers = [10, 15, 20]
+var time_available : int = 0
+var timer = Timer.new()
+# Characters
 var enemy_stats : CharacterStats
 var player_stats : CharacterStats
 var enemies_dict : Dictionary = {}
 var player_current_health : int = 0
-var stash_data : Dictionary = {}
 
 func _ready() -> void:
+	# test file loading from folder
+	print_debug("Raw level names: " + str(level_names))
+	for level_name in level_names:
+		var level_path = "res://scenes/levels/" + level_name
+		levels.append(level_path)
+	print_debug("Adjusted level names: " + str(levels))
 	# load in characters
 	enemy_stats = load("res://resources/slime_stats.tres")
 	player_stats = load("res://resources/player_stats.tres")
@@ -48,8 +64,6 @@ func second_counter() -> void:
 	timer_updated.emit(time_available)
 	if time_available <= 0:
 		print_debug("You ran out of time! Emitting level_changed signal")
-		#get_tree().call_deferred("change_scene_to_file", levels[current_level])
-		#await get_tree().create_timer(1.0).timeout
 		level_changed.emit(levels[current_level])
 
 func reset() -> void:
@@ -57,17 +71,7 @@ func reset() -> void:
 	enemies_dict.clear()
 	player_current_health = player_stats["starting_health"]
 	time_available = timers[current_level]
-	print_debug("You have %s seconds to find all the coins" % str(time_available))
 
-func _on_trigger_fired(intent: Variant, body: PhysicsBody2D) -> void:
-	print("Game controller knows %s trigger fired " % intent)
-	match intent:
-		"destroy":
-			print("Destroy this thing!")
-			if body is RigidBody2D:
-				destroyed.emit(body)
-		"powerup":
-			print("Power this thing up!")
 
 func on_coin_collected(_body, coin) -> void:
 	print_debug("GC knows coin collected")
@@ -80,13 +84,11 @@ func set_total_coins(value) -> void:
 	coin_collected.emit(value)
 	print_debug("Setting coin total to %s" % str(value))
 	if value == 0:
-		# You won!
+		print_debug("You beat Level %s!" % levels[current_level])
 		current_level += 1
 		if current_level >= levels.size():
 			current_level = 0
-		#await get_tree().create_timer(1.0).timeout
 		level_changed.emit(levels[current_level])
-	#total_coins = value
 	print_debug("There are %s coins in the level" % str(value))
 
 func on_player_slimed(_body, slime) -> void:
@@ -152,3 +154,13 @@ func stash_game(stash) -> void:
 func set_player_health(value: int) -> void:
 	print_debug("Setting player health to %s" % str(value))
 	player_current_health = value
+
+#func _on_trigger_fired(intent: Variant, body: PhysicsBody2D) -> void:
+	#print("Game controller knows %s trigger fired "change_scene % intent)
+	#match intent:
+		#"destroy":
+			#print("Destroy this thing!")
+			#if body is RigidBody2D:
+				#destroyed.emit(body)
+		#"powerup":
+			#print("Power this thing up!")

scripts/level.gd

@@ -0,0 +1,21 @@
+class_name Level
+extends Node2D
+## Documentation comments
+
+## Signals
+## Enums
+## Constants
+## @export variables
+## Regular variables
+## @onready variables
+
+## Overridden built-in virtual methods
+#func _init() -> void:
+#func _enter_tree() -> void:
+#func _ready() -> void:
+#func _process(delta: float) -> void:
+#func _physics_process(delta: float) -> void:
+## Remaining virtual methods
+## Overridden custom methods
+## Remaining methods
+## Subclasses

scripts/level.gd.uid

@@ -0,0 +1 @@
+uid://djv8gud535in5

scripts/scene_manager.gd

@@ -1,5 +1,6 @@
 class_name SceneManager
 extends Node2D
+## Handles adding and removing scenes, building levels
 
 var bullet = preload("res://scenes/bullet.tscn")
 var coin_scene = preload("res://scenes/coin.tscn")
@@ -13,12 +14,18 @@ var total_allowed_bullets : int = 7
 @onready var crates: Node = $"../Crates"
 @onready var enemies: Node = $"../Enemies"
 @onready var player: Player = $"../Player"
-@onready var ui: UI = $"../CanvasLayer/UI"
+@onready var ui: UI = $"../UILayer/UI"
 
 func _ready() -> void:
 	GameController.reset()
 	build_level()
 
+
+func _on_world_boundary_body_entered(body: Node2D) -> void:
+	if body is Player:
+		var current_scene = get_tree()
+		current_scene.call_deferred("reload_current_scene")
+
 func build_level() -> void:
 	if coins:
 		update_coins()
@@ -26,7 +33,8 @@ func build_level() -> void:
 	var _total_enemies : int = 0
 	if enemies:
 		update_enemies()
-	# Wire up signals from GameController
+	# Wire up signals 
+	# GameController
 	GameController.level_changed.connect(change_scene)
 	GameController.destroyed.connect(destroy)
 	GameController.game_saved.connect(on_game_saved)
@@ -34,9 +42,11 @@ func build_level() -> void:
 	GameController.player_damaged.connect(player.handle_damage)
 	GameController.player_damaged.connect(ui.update_health)
 	GameController.player_death.connect(player.handle_death)
-	player.player_died.connect(GameController.handle_player_death)
 	GameController.timer_updated.connect(ui.update_timer)
 	GameController.coin_collected.connect(ui.update_coins)
+	# Player
+	player.player_died.connect(GameController.handle_player_death)
+
 
 func update_enemies() -> void:
 	var total_enemies : int = 0
@@ -85,10 +95,6 @@ func bullet_factory() -> Bullet:
 	bullet_array.push_front(my_bullet)
 	return my_bullet
 
-func _on_world_boundary_body_entered(body: Node2D) -> void:
-	if body is Player:
-		var current_scene = get_tree()
-		current_scene.call_deferred("reload_current_scene")
 
 func change_scene(level) -> void:
 	print_debug("Changing scene to level %s" % level)