Absolutely unplayable trash. A tech demo where the biplanes and clouds move around in full 3D, in the bitmap scaling technique used for home PC games like Wing Commander used at the time. Great, right? Well, no. Because the entire game is just you aiming yourself at the first plane, mashing the fire button, and then losing to the next wave of two planes. In less than 2 minutes you've seen the entire game, have fun repeating it I guess.