You are the bubble with eyes. You control it with the mouse, you can click to move. Try to avoid the fish because they will kill you. (And we don't want that to happen, do we?) To get points, collect the bubbles. They make you bigger though, an d more prone to get eaten by fish. To solve that problem, collect sponges. They will gradually reduce you back to size.
This game is based on a mini-game in the DS game '101 in One Explosive Mega mix' called Aquarium. I totally recommend you check it out! Also, I'd like to thank Scratch for the music backdrops, and fish. It really helps out a lot to have pre-made assets!