I don't understand how I'm meant to progress in the game. I can get the mushrooms from the glowing cave and make potions with them, but either the selling just doesn't function, or I don't understand how it works, since every time I drop the potions I make into the box next to the vendor and press sell, the potions disappear, but I get no money. Also what are you meant to do in the roots cave? Every time I tried, I only got a few steps into the cave before something big rushes at me from the darkness too fast to react to and immediately gets me.