The film that inspired first person shooters
First person shooter video games first started in 1992 with "Castle Wolfenstein" whose story was like a direct copy of this film. These kinds of games are now a multi-million dollar industry and they owe it all to this movie which was the original inspiration.
Not to mention George Lucas must've been very inspired by this film too because there are many shootout scenes that seem very similar to the scenes on the Death Star in the original Star Wars.