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

scripts/ammo_spawner.gd

@@ -0,0 +1,34 @@
+extends Node
+
+@export var ammo_scene: PackedScene = preload("res://scenes/ammo_pickup.tscn")
+@export var spawn_interval_min: float = 5.0
+@export var spawn_interval_max: float = 15.0
+@export var spawn_radius: float = 300.0
+
+func _ready():
+	spawn_loop()
+
+func spawn_loop():
+	var wait_time = randf_range(spawn_interval_min, spawn_interval_max)
+	await get_tree().create_timer(wait_time).timeout
+	spawn_ammo()
+	spawn_loop()
+
+func spawn_ammo():
+	var player = get_tree().get_first_node_in_group("player")
+	if not player:
+		return
+		
+	var pickup = ammo_scene.instantiate()
+	
+	# Randomize type
+	pickup.ammo_type = randi() % 2 # 0 or 1
+	pickup.amount = 10 if pickup.ammo_type == 0 else 5 # More AP than HE
+	
+	# Random position around player
+	var angle = randf() * TAU
+	var distance = randf_range(100.0, spawn_radius)
+	var pos = player.global_position + Vector2.RIGHT.rotated(angle) * distance
+	
+	pickup.global_position = pos
+	get_parent().add_child(pickup)