Andrew Catling is reported to have done another Archimedes game called "Drop ship" published by a company called
The Fourth Dimension, perhaps you'll have more luck finding him using this reference?
Game author to me sounds like he did the programming AND the artwork.
Let me know how you make out, I have an ace in the whole, I (used to) know the games programmer who ported Quake to RiscOS and if anyone knows everything about Acorn and games then it's going to be Martin!