Kill Em All

With graphics inspired by Alien³, this 1997 shareware game from Muzzasoft's Alastair Murray and Ben Wyatt is shooter that had a lot of effort put into it and it shows. A decade earlier this could have been a boxed release. Kill em all is a precursor to Countdown to extinction, which is a precursor to Traitor. If you registered the game for 6 UK Pounds, then you got more levels from the author. The original version was likely from 1993, but we only have the date of the final updates and release.