The game can also be played in colour using the Chroma 81 SCART interface or with any of the growing range of emulators that support the interface.
Full details about the game can be found at www.fruitcake.plus.com.
I hope you enjoy the game!
The graphics looks very nice, and the movement is good. You'd never think this is a ZX81, or even pseudo-hires. More like a monochrome Spectrum-game. Inspiring.