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

scripts/camera_zoom.gd

@@ -0,0 +1,24 @@
+extends Camera2D
+
+@export var zoom_speed: float = 0.5
+@export var min_zoom: float = 1.0
+@export var max_zoom: float = 5.0
+@export var zoom_smoothing: float = 10.0
+
+var target_zoom: Vector2
+
+func _ready():
+	target_zoom = zoom
+
+func _process(delta):
+	zoom = zoom.lerp(target_zoom, zoom_smoothing * delta)
+
+func _unhandled_input(event):
+	if event is InputEventMouseButton:
+		if event.is_pressed():
+			if event.button_index == MOUSE_BUTTON_WHEEL_UP:
+				target_zoom += Vector2(zoom_speed, zoom_speed)
+			elif event.button_index == MOUSE_BUTTON_WHEEL_DOWN:
+				target_zoom -= Vector2(zoom_speed, zoom_speed)
+			
+			target_zoom = target_zoom.clamp(Vector2(min_zoom, min_zoom), Vector2(max_zoom, max_zoom))