It's called Meremanoid and it has some incredible art and a low-poly underwater world to explore! Gosh, I swear you can explore the PS1 library for your whole life and still come across magical little surprises like this.

Parallel universe aficionado and proud father of Arle Nadja.
23, mixed white/Taíno (🇵🇷/🇩🇪), ⚣🐻

It's called Meremanoid and it has some incredible art and a low-poly underwater world to explore! Gosh, I swear you can explore the PS1 library for your whole life and still come across magical little surprises like this.
I still need to get this game. Of course, I should probably wait until I've decided whether to keep or sell my Japanese PSone and games collection :|