Not bad at all
A fairly addictive game. Yes, if you grab a flight power-up while a growth one is active and then you get back to water, you'll be eaten even if you're in oversize mode.
It would be nice if you could change your fish's species by eating many specimens of a certain kind in a row; this way, diffent types of fish could have different boosts and power-ups. Then again, it would be nice to have a multiplayer mode.
I'll be waiting for the sequel. Keep up the good work.