The sound effects are pretty harsh on the ears, and the game seems to require a refresh to play again after a game-over; though there is potential and it obviously follows the theme of the competition.
I'd suggest some way the player can affect their speed using up and down arrows, allowing them to move to the screen's edges but no further as the camera ascends and descends. Would probably help the game to feel less repetitive as you have to descend through hundreds of meters of empty space that you already cleared out.
Understandably this is a game jam game so maybe you had more ideas that didn't pan out in time, but perhaps different types of obstacles or something to spend treasure on would be some of the first things to focus on (after the sound effects) if you were to continue with this idea.

amogus but scuba