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It also was memorable for the giant evil happy face that would come out of nowhere if you took too long trying to dispatch the regular robots. This evil happy face was indestructable and faster than you. You could maybe outrun it if you were near an exit, but otherwise, the evil happy face would run you down and bounce on you with its evil happy face.
There is also a sequel called Frenzy, but I never knew of its existence until emulators came along. Basically the same thing with a few more obstacles, like walls that would ricochet your lasers and differently shaped robots.
This was the easiest creation I've made so far. I mean, 13 pieces, no weird angles, and all one colour. Took me less than five minutes total. Oh well, I already know what I'm making for December, another oldie that appears more difficult than I expected. Stay tuned!