I like the theme very much, it quickly caught my attention. The effect on screen looks great.
It was hard for me to understand combat but after few tries i get it well;) Would be great if you add save at the start of cyberspace, or consider inscreasing lives at the beginning, because it took few runs to understand mechanics and experience will be better if there won't be necessary to starting all over again many times.
Overall I like it very much, well done ;)