This is the classic two-player dogfight, as seen on a thousand Atari video games.
Two bi-planes, in a cloudless sky, are trying to blast each other to bits with machine guns. Your opponent must be hit ten times before you win.
Graphics are better than on the Atari vesion - I particularly liked the way that the loser parachutes out of the plane that gets hit, and the bits falling off the plane.
Sound effects are good, too, with engine noise rattling away constantly.
Instructions are clear, and you have the choice of control by two joysticks or keyboard and joystick. There is no option to play against the computer, which is a shame.
The set-up is good and so is the implementation, and the whole thing seems to be relatively bug-free.
It would be an excellent game at £5, but at £10 I think it's grossly overpriced for what is basically a revamp of an old idea. There is much better value on the market than this.