So I love fishing games, and this one is no exception. It's super cute, the palettes are nice, I love the atmosphere from the sound effects and very cute, "you're casually swimming underwater" music. I'm especially impressed with how you managed to portray lighting with the limited colour palette.
I found the controls a bit confusing at first; it's interesting how the game takes the arrow key to specifically mean to move in that specific direction rather than using the left and right arrow keys to steer and up arrow key to propel oneself forward. I think it does make more sense to have the corresponding arrow key move you in the direction you want to go; I guess...I wasn't expecting it to be like that for some odd reason. :P
It's a little odd how the screen gets super wavy when you descend. For me, it sort of took away from the atmosphere and made it look distorted. I was also able to teleport between walls in the space between two very thin brick columns underwater, where a fish was bobbing in between. Not sure if this was intentional or not, but it was unexpected, to say the least.
Aside from those two things, this was a great culmination of art, gameplay and music coming together to create a very enjoyable and adorable game. The chromatics and cadences in the swimming track are beautiful. Fantastic work for a jam entry, though.