Thanks! What's your Twitch channel? I'd love to watch your playthrough.
With regards to the mushroom: you may be able to use it in one of the future rooms (snowy rooms). Mind the name of the item. 'Spongy mushroom piece' -> does it give you an idea of what to do with it? Hint: what would you do with a sponge? The oil is inside, and you need to get it out. Let me know if that helps!