Ok so this game was brought up to counter the "Mario 64 is the first 3D platformer" or something. While i personally can't be sure if Mario was indeed the first, (although i'm sure it was the first that did it right) this particular PS1 game doesn't look like it's anything close to a "real" 3D platformer:
https://www.youtube.com/watch?v=o6Z3w8dBfa4
This looks like an overhead 2D game with polygon graphics. Much like those platform games like Goemon Adventure and Pandemonium that have 3D graphics but you can only move in limited directions. I haven't seen many videos of it but there is no verticality here, just a plain floor and some 3D walls and backgrounds. Yes, the game has 3D graphics but so did Crash Bandicoot. Yet Mario 64 is actually using that 3d dimension for, you know, actual 3D movement and exploration. And actual 3D level design with verticality, 3D structures you can climb, enter, explore, a controllable free roaming camera, etc.
Again, i'm not claiming that Mario was the first ever in this and that, but this PS1 game seems like desperate reaching to counter a popular argument, just for the sake of countering it.