the author of this app says:
Boyan is a game based on the classic arcade hit "Pooyan."
In Booyan, you play a ... thing. And you go up against mean and nasty ... other things.
You see, the evil aliens have chased you to your last place of resistance. The aliens try to parachute down to the ground, so that they may climb a ladder and route the poor good guys out!
You only hope is to shoot them down (they parachute down using ballons for some reason, so what makes them so ... menacing?), and send them spiraling to a grisly demise.
Boyan is a fun game with great cartoonish graphics, and should be a hit with gamers of all ages!