I couldn't work out the controls to get it to do anything -- it responded to 'R' so the controls are flushing but nothing worked. It looks like a neat little idea tho
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On the first level, you can only hit a ball (Click on the ball and drag the mouse, the arrow in the top left screen will show you a direction and a power). On the second level, you can move the camera (WASD, mouse wheel). On the third level, you will be able to place objects (Click on an icon, WASD, QE, then ready and hit a ball)