Written by Jonathan Smith (known programmer for his Spectrum works) when he was first hired at Rage Software, the game was a shoot ’em up scheduled for Super Nintendo around 1993. Sadly Cluster Buster never found a publisher. Here is what Joffa Smith recalled about the project in an interview with World of Spectrum:
With new offices in Bootle, I started work on an original game called Cluster Buster on the SNES. This was an eight-way scrolling defender style shoot’em up, with huge exploding planets and moons. Unfortunately no-one was interested in publishing it (Sonic the Hedgehog was all the rage) so it was abandoned.
Scan from Nintendo Magazine System issue 10.