It's only got five chapters (or four if the first chapter was a prologue) but it feels distinctive from others stories I've read. I mean,
"we can't have our own zombie apocalypse so make it on VR world so the virus won't spread into our real world."
Anyway, everything is in a good state, especially the scenes with guns and booms... if you can describe it more "gore-ly" and add more blood, it will be much better. The characters seems unique, and the AI as well.
Overall, good job.