Please fix your rating. This isn't a mature game.
Gameplay was a bit choppy and the scores frequently glitched out.
Unfortunately, the game got old very fast. Nothing to keep it really interesting. You have a lot of room for improvement here.

A copy of Fishy.

this is just like Fishy, just with levels and time. PLAGIARISM!

Meh

Not a particularly fun game, especially when the "big" fish will spawn randomly on top of the controlled fish.

Quick Summary

This is like a bad version of hungry space.

Some fixes you can do to make it slightly better:
-Make it so that if a player presses "up" and "left" at the same time, you go diagonally. Same for the other diagonals.
-Make it so that the fish don't spawn in a ... retarded ... manner
-If you don't die instantly from touching a big fish, give a health bar so that we know when we die.
-Some animation on the other fish would be nice.
-Something happening other than "score = score + 10" when you eat a small fish.

Those are the things I can think of off the top of my head to just make this a better version of this. I'd still probably rate that only a 5-7 because it is still probably going to be boring. Just not as low quality as this is.