Okay, not sure that this counts, but if you have an Atari STE and a Jaguar joypad or similar 15 pin controller, you may want to check out r0x Zero. Released last year at the SillyVenture Atari scene party in Poland and written by a bunch of German demosceners, it's a vertical shmup where you have to blast through waves of enemy mooks. Your score is based on keeping up a multiplier by chaining shots and so forth. It is also random in that the patterns that the enemy come in are different every game though from predetermined patterns. Add to this some truly awesome chiptunes and butter smooth gameplay and this is the sort of thing we could have been playing in 1989 had Atari not totally failed to market the STE leading developers to simply assume that everyone had a standard ST and not to bother coding for the STE's extra bits like hardware scroller, blitter, stereo sampled sound, etc.