Paratrooper video remake

Recently I’ve been playing with augmented reality and coded this demo. I know that it can be improved (I played with technology, not with graphics or sounds). If you enojoy it – please help me to make it better…

This demo was coded with respect to old paratrooper game(1982). You should intercept paratroopers before they reach the land. Now you don’t need a gun – play with your fingers, hands or head(s). Just sweep the figures beyond the screen frame. You need to collect smiles-bonuses to pass to the next level.
Made with Qt and OpenCV