Design an App Mockup

A single page for the foundation of a game. A page shaped liked 'Tetris', a bomb will fall from the sky and there will be a city landscape along the bottom of the page (not taking up much height, but prominent enough to be recognised) above this, will be three rows of three shields (again, these cannot take up too much of the height, as the bomb will bounce off these shields and reflect back off the top and sides of the page). There must be room for both the bomb to bounce around the top and sides of the screen, and for the shields to be big enough that they can be selected easily by touch on a phone sized screen.