Drag the view point with the middle mouse button.
Press any other button to kill one of the little blighters.
Follows a very basic swarming algorithm, rules are roughly:
Each of the components are scaled and added together. The resultant velocity is also capped at a maximum speed.
In addition each cube turns to face the direction its flying in, and the frequency of the flapping wings increases with speed.
Yes, the shotgun sound is the one from Quake ;-)
And I drew the gif's myself (can you tell ?) ;)