Thank you for your kind feedback. The idea with visualizing the cooldown for the wistling is pretty smart and if we continue working on the game we will defenetly include it.
The room you get stuck in was the last level and we experienced that it is way to hard. We thought about including a video with a full walk-through on the itch page. Would this help you?
But if you actually got this far great work, because even to this point its not easy.