As with everyone else that has commented so far, I am really enjoying this game. Unfortunately, I too found a bug, and it's actually not the same one that has already been reported. It's just a minor thing, but if you go to the system menu and uncheck then check the Drones option, when you go back to the game your shooting drones no longer appear! You either have to close and reopen the game, or go back to the system menu and uncheck and check the Drones box again.