Glitched out the final boss fight — the boss was completely invulnerable, and I couldn't die either. I had no save for hours, so I would have to redo a lot. This is completely unacceptable. Maybe the JP NES version is bugged? Anyway, it sucks really hard to be locked out of the game when I was so close at the finishing line.

It's cool how talking to NPCs helps you move along and really incentivates exploring... but some clues are really darned obscure (inspect that ONE pixel in the river).