Wikipedia
Robon
Robon is a ZX Spectrum video game developed and released by Softek in 1983. The game is a Berzerk clone.
"A superb version of the popular arcade game in which you are trapped in a series of mazes which are inhabited by vicious Robon of ZOL III. You have your laser to blast through the waves of Robon, but as you get better they get faster and more numorous. Take too long and the dreaded Robon will get you...."