Well, thanks in advance for reading this post.
So, there's this game on the PSOne (i'm sure it is on the PS) with this stage that everything, but the walls, floors, traps and enemies are white. There are some stages where you must pass some cavern-like places. Definitely , there's a lifebar on the left. You start controlling a robot-guy like and when you finish the game (i think), you can control a robot-girl like. It's a 3D [action-adventure] game on the PS.

Please, help me, i was looking for this game for A LOT OF YEARS, and since i don't know the name, it gets almost impossible to find.
Thanks in advance.