Really enjoyed this one more than I thought I would! I think the way you weaved the story narrative into the gameplay was excellent, great job on that! The music and sounds were nice and I liked that it changed in tone as the story unfolded. I'm also glad the ending wasn't what I thought it was going to be (you'll see what I mean if you watch my playthrough 🤣). Really my only criticism is that some of the sprites were a little difficult to tell what they were, especially the trash. The gameplay itself, while basic, serves its purpose well. I think if you were to expand on it by making the fish and trash move around a bit, or even get more scarce as you get deeper, would go a long way to making it more engaging.
Anyway, awesome job! Here's my gameplay video playthrough of it, hope you enjoy it and get some valuable feedback from watching!