Depth Hunter 2, the Name says it all.
Basically you swim around and cowboy your way through the Areas, the only thing that can stop you are some red warning Lables that tell you not to kill Turtles, Manta Rays, Crabs and some other Species.
You can also collect Gold Coins and Treasures, for my taste there are "a little" too many of them.
You can earn Gold with hunting, completing challenges or taking Pictures of the Lifeforms and use it to buy upgrades for your Camera, Harpoon or your Oxygen supply so you dont have to swim to the Surface every few Minutes.
You cant die, when you run out of Oxygen, you will just be "teleportet" to the Water Surface. Some Positive and Negative things short:
+ The Game has easy Controls and is easy to understand.
+ As mentioned, you can upgrade Weapon, Oxygen Supply and Camera.
+ The Water looks good
+ You can hunt some of the Species
+ Only a small downloadsize of ~500Megabytes
- No Multiplayer
- Sealife animation looks weird, almost like on rails.
- Annoying and Facebookgame like Music and Sounds.
- Overall the Engine and Textures, beside the Water itself, look really dated and ugly.
- Rather small gaming Areas
- The Mouse movement and acceleration... oh well...
Not sure what to say as closing word. Lets say its fun for a little while, but you will forget about it really fast.
Also if you really, really want it, i would wait for a ~75% sale! its not worth the current price of 14,99€.