Fun idea! The gameplay is not too easy to make it bland but not to hard to make it annoying, and the overall 3D effect is very convincing. My only suggestion is whenever the objects get close to you, instead of popping them out, you can have the objects start moving away from the centre, so that the objects move to the edge of the screen.
Oh and did I mention this game is super addicting? So fun, got a high score of 128 :D