Wikipedia:Articles for deletion/Space Zap
I wasn't able to find  reviews of Space Zap per se, but I was able to locate two sources covering Space Fortress, a port for the Bally Astrocade.  If it could be determined that Space Fortress faithfully replicates the gameplay of Space Zap (and hence the two are basically the same game), the following references should help establish 
— NONE, NONE
Stance: comment
Cited policy: WP:RS||WP:GNG (Wikipedia:Reliable sources)