If there's one game that genuinely fits the term 'hidden gem' it's Terranigma.
- Great JRPG with a badly timed release date
- It unfortunately never made it to the US (Huge market loss)
- It was drowned out by the combined might of Square RPGs and Dragon Quest RPGs on the SNES
- It released a year after the PS1 launch (2 years after in EU)
- It was never ported to PS1
So when people online in the west started discovering and discussing this game at large around the late 2000s when sharing SNES emulation/rom stories on forums and gamefaqs, it was far, far too late to support it.
I just hope that if this fan sequel is good, the creator will hopefully make an indie JRPG and earn money doing this.
Edit: If you're curious, Terranigma plays like a mixture of Secret of Mana, Beyond Oasis, and LttP Zelda.