Art style is pleasent, and is well complemented by the upbeat music. Nice level of difficulty too, I only got to a highscore of about 1080 before I died.
Very clever to add in the fish that swim from the side. Adds a whole new dimension to the game.
Not much to say on the improvements front. Maybe add some progression in visuals as you travel further down or powerups.
Neat little submission, well done!