I'm sorry to hear that, you can collect forage from the forest and sell it to the merchants (they can also scam you for money) - you can also buy upgrades from the wizard which makes collecting money much faster. Huge respect for playing till the end from just killing goblins! I'll keep in mind to make the gameplay mechanics more clear in my future games
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Oh, I also collected and sold things. It just seemed like it'd be faster to kill the goblins, since those seems to be an average of like 10 gp per goblin, where the foragables seemed to not sell for much, when considering the fake coins. I did get the inventory upgrade from the wizard, but when I went back to him, there wasn't an option to buy anything else.