First of i really liked this game!
The fish are really nicely designed and moving the camera via panning is really fluid.
My only issues are when i open the fishdex and click on arrows the character everytime makes a photo in the game and this next one is little but would really improve your game, which is the player pixel design and background pixel ratio do not match, they should be the same to make it look more together.
I really like it that you look and take photos of fish and slowly see your dex get filled out as well as i think it motivates to finding all the fish. Good Job!