Game now have a level system.

scripts/comet_spawner.gd

@@ -14,12 +14,13 @@ func _ready() -> void:
 	for comet in range(comet_count):
 		random_position.x = randf_range(viewport_size.x - 100, viewport_size.x)
 		random_position.y = randf_range(viewport_size.y - 100, viewport_size.y)
-		spawn_comet(0, random_position)
+		spawn_comet(2, random_position)
 
 func _process(_delta: float) -> void:
 	viewport_size = get_viewport_rect().size
 	if $Comets.get_child_count() <= 0:
 		screen_cleared.emit()
+		queue_free()
 
 
 func spawn_comet(size : int, pos : Vector2) -> void:

scripts/game.gd

@@ -1,24 +1,33 @@
 extends Node2D
 
 # TODO: Display a game over screen when the ship is hit by a comet with abilty to restart
-# TODO: Detect when all comets are gone and increase the level (& maybe speed?)
 # TODO: Make a space like background, maybe some scrolling, maybe randomly generated
 # TODO: Make a small title screen that starts before the game scene
 # TODO: MAYBE track high score in a file & show it on HUD
 
-@export var level : int = 1
-var score : int = 0
+const COMET_SPAWNER = preload("res://scenes/comet_spawner.tscn")
 
+@export var level : int = 1
+
+var score : int = 0
 var points_per_comet := 300
 
 func _ready() -> void:
-	pass
+	new_level(level)
 
 func _process(_delta: float) -> void:
 	update_ui()
 
 func new_level(current_level : int) -> void:
-	pass
+	var comet_spawner := COMET_SPAWNER.instantiate()
+	comet_spawner.comet_count *= current_level
+	comet_spawner.comet_shot.connect(increase_score)
+	comet_spawner.screen_cleared.connect(level_finished)
+	self.add_child(comet_spawner)
+
+func level_finished() -> void:
+	level += 1
+	new_level(level)
 
 func game_over() -> void:
 	pass