Found out about a new game via Android Police recently: Grow. You start out as a tiny egg in a jar and eat other fishes to grow. It says there are 7 environments but so far I've only been in the jar and tank. It's $1.99 which I think is a fair price, and my first paid game! 
My only criticism is that the virtual joystick can be hard to manouever, especially if your screenprotector or fingers create too much friction.
Enjoy!

My only criticism is that the virtual joystick can be hard to manouever, especially if your screenprotector or fingers create too much friction.
Enjoy!