I love the setting and story of the game. Underwater setting is always cool especially if you can pull it off and you absolutely did. The amibence of the game with the superb PS1 aesthetic and ambience sound is very well crafted. I especially loved the enemy design. The creepy sound effects of the enemies, glowing blue eyes, they really look scary(The shark is my favorite).
The movement didn't bother me that much but turning around could a littler faster. Afterall the game is set underwater and you cannot move the same speed under the water as you do on the surface. I think you managed to give the immersion to the player that they are really underwater perfectly. With sound effects, bubbles, particle effects etc.
Combat is intuitive, it feels very good. There's a little glitch which others mentioned as well. Enemies get to the same tile as you do to attack the player. I think you did enemy pathfinding with an algorithm like A*. You can solve this by setting the target for enemy one or two tiles away from the player, that's how i did it.
Storytelling is top notch. I love that you get tidbits of information about the story with those audio logs(?). The ending was a banger, i totally dig it.
My final thought are i think it's one of the strongest contenders of the jam especially in terms of visuals, atmosphere and setting. It plays more like a horror game than a dungeon crawler minus the grid based movement although i like it anyway. I think this is a an excellent game to complete in 9 days and it's very polished as well. Sooo double thumbs up!!