I found an infinite money glitch that is very easy to do. Unfortunately there doesn't appear to be a way to do spoiler tags on this site so I'm uncertain how to share it without just shoving it into everyone's eyeballs.
Maybe pressing enter a lot will help? Imma give it a go, so if you don't wanna know, stop reading now.
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Water can be bought from the potion shop for 5 gold, and sold right back to the potion shop for 45. You can hold a maximum of 200 water at once, which means that each loop can earn you 8000 gold.