Described by the developers as a homage to zombie video nasties, Zombi Terror is a graphical adventure game with a combat system and, unsurprisingly, zombies which comes with an optional audio track that can be played in the background. There are also versions available for Windows and the Megadrive with more to follow.
Edit on 07/08/2014: the Kabuto Factory website appears to be down right now, in the meantime this game can be downloaded from this location - the file is just the English version of the game and manual for now.
• External link: Zombi Terror at the Kabuto Factory website
• News source: World Of Spectrum forums