First and foremost, niceeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee, I adore the deep sea and I'm equally fascinated and terrified by it in real life so I just couldn't resist playing this game. The art design is minimalistic without being bland or uninteresting (it reminds me of Samurai Jack's art style, particularly AKU's fiery eyes and black silhouette which looks similar to the creatures in this game) so 5 stars on that.
The creaks of the old rusty metal adds to the creepy vibe to the game.
Also, I love how the game portrays there is always bigger fish in the sea but it was a bit disappointing you cannot lose the fish around 30 sec mark. I tried to make the bigger fish eat/ impale it on it spike but it just shoves it to the end of the screen. (I think that was the point)
Around the 55 sec mark i saw the JAWS reference (dont know if it was intentional but was cool none the less) and I did manage the get rid of the mean fishy that kept following me for a bit. (which was a relief)
Improvements try to remove the mouse cursor (to make the game more immersive) and make the screen much more dimmer (so it much more creepier, I played the game with low brightness and it was awesome experience),
PS: Let me know if you want to develop this game further. I'm interested if you want to collab.