Nice game! Really liked the idea and the music. Gameplay-wise, I think it would be nice to have a "picked-trash" counter, and maybe some more game-feel elements too, like pushing back your character when he gets hit (or particles appear), a higher sound... Just something that tells the player more clearly when hit. Also, since the game is located underwater, maybe more background elements like plants, sea creature or caves would make the scenario feel bigger and full of life!
Great experience, keep it up!