Interesting concept. But I think it could have been implemented better. I like the underwater look. It actually looks like it. But at times I didn't understand which number would change if I collected a new number. You can make that clearer. And once I go beyond the number that I have to reach. Like I had to make 2= and I collected other things and reached 125.5. Now how would I reach back to 2? You should look into it. Maybe a reset collectible. Also there could be other fish that eat up the numbers before you can collect them.
Oh, and the game should be called something like - Professor Fish.