Thanks for your very kind comments and ideas. You are spot on about the bullet collision. I wanted it bigger but found it was losing too many shots hitting the walls. Maybe I need to collision shapes? Yes, I'd love to put in more upgrades for the "work" phase. I also wanted to be able to buy and place barricades. Haha, but that would have meant not sleeping for a week. Going to take a break and add all of the lovely ideas people have put forward. Again, thanks. It means a lot :)