I played 2 hours of this shark simulator. It's very simple and a bit rough, but somewhat satisfying to level up your shark and upgrade it. It reminds me a lot of SNES evolution action RPG E.V.O.: Search for Eden.
This is very much an action RPG. Right now, I'm trying to collect the bone 'armor set' which gives me better defence. The basic gameplay is pretty mindless, but somewhat satisfying, and I enjoy the way the game looks under water.