Dumb.
seems like a rushed games.
If you get the X that makes you grow for a short period you need a warning when it is about to run out. (like blinking or something) because if you are eating bigger fish and then it runs out you just die because your just all of a sudden small again in front of the fish you are trying to eat that can now kill you.
Also I would add lives or something so it is not game over right away. Game could be much better