That's amazing! I'm glad you both enjoyed it, and those retro White Dwarfs are filled with so much cool stuff!
You didn't miss any rules regarding cover, I didn't put any in - while writing I couldn't think of anything that didn't slow down shooting more than I wanted it to, your solution of having it count as a shield is perfect! I've been keeping all of the notes and feedback that people have messaged me with since releasing the 'finished' game, once I have enough I'll put together a Revised Edition, and this mechanic for Cover is definitely something I'll add in if you're happy for me to!
Thank you as well for spending time to leave a comment, it's really appreciated : )