Apparently the translation was so bad that you had to switch to English, sorry...
Did you really farm 400 gems to buy a potion upgrade? In theory, you need to buy it when in the full version you return to the village after a short adventure)
Sorry, my streaming is apparently watched by English speakers too, so I play the works that have language selection in basic English, using OCR software to read them and machine translate them. I earned the 400 gem because I was curious, it took me less than half an hour, nya!