I haven’t played the game for very long, but from what I’ve seen it would take a few hours to get to the point that you can just get a thousand bucks and blow them on a title, but it’s entirely doable. You would have to focus on upgrades anyways to start with just to get a proper income up and running, and then once you can fish with greater speed and with a greater success rate it should be fairly trivial.
Minish Cap is just absolutely amazing. The world is small, but very well made and fun to explore. It has aged very well (I imagine most GBA games have?) so I would recommend everyone to give it a go if they like that sort of game!
I’ve never tried any Castlevania games, maybe it’s time.