I was really impressed by the amount of detail you were able to put in this game. Visually it is a very coherent game, the high fidelity suits well the themes you approach. From an audio perpective, I played with a monitoring headset and the playthrough was a treat, having voice acting really helps to convey the emotions and filled the space with some kind of dark heavy tone.
Gameplay wise I found that the loop worked well and contrarily to the other comment I didn't had any difficulty to find what to do next. Maybe the movement was a bit slowish as a human and undewater, but it could also be voluntary so i'm not having a problem with that.
If I had one advice, it could be that the items used during the game could have been related to the characters backstory, to emphasize on the trauma/memory themes. But other than that it was a great experience, congrats !