Very nice twist on the fishing minigame! One nice bit of game design is the way that the oil tanker is placed right at the beginning of the game. I knew exactly where the game was going after I started growing, and it was fun to go back and take down the tanker when I knew I was pretty big.
The art style works pretty well, and I also liked the music.
One small note is that it is pretty easy to "cheat" to some degree by clicking F and the mouse button and the same time. I honestly don't think is really a problem, as it can make the strain from repeated button pressing less annoying.