feat: Implement core game mechanics including player, enemies, bullets, HUD, and level setup.

scripts/spawner.gd

@@ -0,0 +1,36 @@
+extends Node
+
+@export var enemy_scene: PackedScene
+@export var min_spawn_time: float = 1.0
+@export var max_spawn_time: float = 7.0
+
+func _ready():
+	start_spawn_timer()
+
+func start_spawn_timer():
+	var time = randf_range(min_spawn_time, max_spawn_time)
+	await get_tree().create_timer(time).timeout
+	spawn_enemy()
+	start_spawn_timer()
+
+func spawn_enemy():
+	if not enemy_scene:
+		return
+		
+	var enemy = enemy_scene.instantiate()
+	get_parent().add_child(enemy)
+	
+	# Calculate random position outside the screen
+	var viewport_rect = get_viewport().get_visible_rect()
+	var camera = get_viewport().get_camera_2d()
+	var center = Vector2.ZERO
+	if camera:
+		center = camera.get_screen_center_position()
+		# Adjust rect size for zoom
+		viewport_rect.size /= camera.zoom
+	
+	# Pick a random angle and a distance slightly larger than half the diagonal
+	var angle = randf() * TAU
+	var distance = viewport_rect.size.length() / 2.0 + 100.0 # +100 buffer
+	
+	enemy.global_position = center + Vector2.RIGHT.rotated(angle) * distance