rock respawn flow, fix flying spawn

scripts/Main.gd

@@ -93,13 +93,57 @@ func _process(delta: float) -> void:
 
 # ─── Rocks ────────────────────────────────────────────────────────────────────
 
+var rocks_on_field: int = 0
+var rocks_pending: int  = 0
+
+func _get_rock_limit() -> int:
+	return mini(2 + (wave + 1) / 2, 7)
+
 func _spawn_rocks() -> void:
-	for i in range(10):
-		var rock := ROCK_SCENE.instantiate()
-		add_child(rock)
+	var limit := _get_rock_limit()
+	for i in range(limit):
+		_spawn_single_rock()
+
+func _spawn_single_rock() -> void:
+	var rock := ROCK_SCENE.instantiate()
+	rock.position = _safe_rock_position()
+	add_child(rock)
+	rock.connect("destroyed", _on_rock_destroyed)
+	rocks_on_field += 1
+
+func _safe_rock_position() -> Vector3:
+	var player_pos := player.global_position if is_instance_valid(player) else Vector3.ZERO
+	for _attempt in range(30):
 		var angle := randf() * TAU
-		var dist := randf_range(3.5, arena_size - 2.0)
-		rock.position = Vector3(cos(angle) * dist, 0.0, sin(angle) * dist)
+		var dist  := randf_range(4.0, arena_size - 2.0)
+		var pos   := Vector3(cos(angle) * dist, 0.0, sin(angle) * dist)
+		if player_pos.distance_to(pos) < 4.5:
+			continue
+		var clear := true
+		for r in get_tree().get_nodes_in_group("rocks"):
+			if (r as Node3D).global_position.distance_to(pos) < 1.5:
+				clear = false
+				break
+		if clear:
+			return pos
+	var a := randf() * TAU
+	return Vector3(cos(a) * (arena_size - 2.5), 0.0, sin(a) * (arena_size - 2.5))
+
+func _on_rock_destroyed() -> void:
+	rocks_on_field = maxi(0, rocks_on_field - 1)
+	if not game_active:
+		return
+	if rocks_on_field + rocks_pending < _get_rock_limit():
+		rocks_pending += 1
+		await get_tree().create_timer(20.0).timeout
+		rocks_pending -= 1
+		if game_active:
+			_spawn_single_rock()
+
+func _check_rock_slots() -> void:
+	var gap := _get_rock_limit() - rocks_on_field - rocks_pending
+	for i in range(gap):
+		_spawn_single_rock()
 
 # ─── Player ───────────────────────────────────────────────────────────────────
 
@@ -166,6 +210,7 @@ func _on_enemy_died(points: int) -> void:
 		kills = 0
 		kills_for_next = int(kills_for_next * 1.6)
 		wave += 1
+		_check_rock_slots()
 		_show_upgrade()
 
 func _spawn_upgraded_enemy(pos: Vector3, type: String, level: int, w: int) -> CharacterBody3D: