You can't do much for now, just walk around the level and... make sure you don't go too deep in the water... :}
I'll need to add some AI and a few things like... if you have 2 monitors right now you'll notice the mouse cursor is not staying inside the game :D tricky bastard seems to be this one. Aaand it needs a loading screen :}
The game is supposed to detect your hardware and if you have an older graphics card it should adjust itself according to limitations... :\ (I hope :D)
But it's not an optimized level so.. you probably need a decent machine to run it :] (the SSAO for example is a bit slow, and you don't have an option to remove it. But you can configure resolution and some basic quality settings manually when you launch the game as well.)
All the models come from the Google warehouse. Thanks Google warehouse! :)
You can download it HERE, unzip it and just click the exe (so only Windows, sorry).