To sum it up in 2 words, totally addictive. If you can sit through a game all night without knowing how time went, well, that’s what I call addictive. Deep Blue Sea has kept me awake for at least more than 2 weeks now and I am in total love with the game. It has lots of nice illustrations and stuff. The basic objective is to collect jewels and get more treasure. You can choose one among four to five characters, each one of them specialised in one thing. It is more like tetris, where you break sets of fishes, crabs and sea horses. There are tools that can you purchase and then upgrade. The game has 200 levels, and I am current on level 140. Given below is a screencapture of the home screen. Its a really beautiful game! Works on a mac, not sure about windows though! 
i totally rely on this game for keeping u awake when really needed. i love deep blue sea!!