Great experiment, however the gameplay is off. Once you realize that the goal is to hit the incoming circles and that a 2D collision detection is used for a "3D" game, it's almost impossible to lose if you just dart back and forth between the center (or just stay in place!). A better idea would be to avoid the incoming circles (and allow being in the center) and have the collision be based on the shapes that are on the camera (z coordinate of 0). Overall, I like the "newness" of the game and I'm giving it a 4 until it improves.
The sharks are just too annoying to get a full score. I suggest removing the high scores all together and just give people infinite lives. That or stop people from submitting high scores if they died more than three times. 4/5
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