Thanks! I didn't have time to implement a proper 3D look around system. I'm actually not sure how to implement it for keyboard since all the arrow keys are currently being used. I could do it Quake style with a mouse, but the mouse is used for other things in a web browser and other systems have poor mouse support. I'll figure something out.
I think the level will be a lot better once I start adding some items to the currently barren seafloor. I was hoping to have objects emerge out of the gloom and serve as landmarks. Adding power-ups sounds like a great idea too!