Good looking fish racer game (now there's a sentence I never thought I'd write ;P)
The controls are hard and only got a bit better for me after not inverting the X-axis. I never even increased my speed as I was too busy aiming the fish ! But I did have fun durdling around with my happy swimmer, bonking into all of the level.
Some music would add to the atmosphere and an on screen timer + progress bar would convey a more racer feeling to the game. I never felt hurried since there was no timer (and I had too much trouble controlling my fish).
I never knew you would be timed if you finished it until I read the comments here ;P
Great job on the game and it sure has potential !