A nice game, the models are nice, and I liked the overall esthetic and ambience!
In my opinion, tho, the game feels a bit bland after a while, as the only things encountered are the occasional fish that kill you, or sometimes an item. The items are also pretty useless in my opinion, I mainly used the gun for fun to not get bored, and the flashlight isn't really needed currently, as the dark depths present no enemies, and you can still see pretty well in the dark. A way to make these useful would've been nice, like enemies you are forced to shoot at to proceed (maybe enemies that follow you), and enemies in the dark you cannot see if you don't catch them in the flashlight. The overall story doesn't make much sense, but I got why at the end of the game...and I think actually leaning even more in the "dream-like" strangeness of the story that unfolds playing through the game would've been perfect, as it would fit the theme in two ways: diving deeper into the ocean, and diving deeper into a dream/mind!
As the final critique, I found the controls a bit slow, as it was pretty frustrating returning back because of exploring a passage with nothing in it.
A very cool game, with some sides to polish, but a great starting idea! Keep it up!