This is a novelty movie jam-packed with good bloody fun and filled with FPS visual tributes. That is its whole point. That is why you want to watch the movie. The content follows the form, not the other way around. Just be grateful for the numerous references (e.g. sidescroller tropes), subtitling humour, and the cameos from both Vader and Wilhelm.
Nekki has announced that the forthcoming gun fu game, SPINE, will receive a movie adaptation to expand the franchise.
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