To be honest, this feels like a knock-off of 'fish frenzy', with the exception that you cannot eat your predator by growing. But zanit was right on point, so I'll refrain from restating what he/she said.

Decent concept, but I have some issues with it
1. Too easy. When you use just the mouse to move around, it feels way too simplistic. Maybe if you had it follow the mouse at a delay, or a slower pace?
2. I found out that the hit-boxes were a tad off. I ate a smaller fish, and then suddenly I was dead because I guess my open jaw hit a big fish? I dunno; it was kind of silly. Still not sure how I died.
3. No sense of accomplishment. Yeah your score goes up; but it just feels like the screen's zooming in, because the smallest fish don't appear anymore, or grew with everything else. And it's frustrating when the same generic large fish is growing at the same rate as you, so there's never a possibility of being 'the biggest fish'.

The game's good, I'll give you that but, the gameplay with a mouse is somewhat easy. It'd be more of a challenge if it was with the keyboard, and probably make a "Highscore Multiplier", but that'd require more coding. It's more of a game to pass the time and probably relieve the stress.

mm pretty cool. i like the simplicity of the design.

Its pretty dull minimal sound design art everything really. Not even an original concept i think ill stick to Popcaps feeding frenzy.