It was Kaiko/A.U.D.I.O.S. Frank Matzke did the graphics, don't know exactly the Kaiko coder for Quik and Silva and Metal Law.
Gem´X was the first real KAIKO-game and was published via DEMONWARE (one of the founders now works again at NEON)...
developed for c64, atari st, pc and of course Amiga... all Versions were finished, but to my knowledge only the amiga and C64-discs actually reached the stores.
As NEW BITS ON THE RAM (or similarly) we finished two budget-games: QUIK'N'SILVA and METAL LAW both came to the public over magazines.