Great game!
I worked at Software Creations during that era and developed the Amstrad CPC version of Ghouls n Ghosts. A beggar to program on 8 bit hardware and not my finest work. My colleague, Mike Follin, programmed a technically excellent scroll routine on the Speccy version, derived from earlier work on Bubble Bobble & LED Storm, that "chased the raster' to run at 25fps and draw sprites and backgrounds on alternate frames without flicker.
The Speccy version of Ghosts n Goblins was a great game for the time & really pushed the Spectrum to its limits.