Hey, I'm glad you liked my game, thankyou for the kind words.
I think I know what you mean about the dark boxes in menu. I assume you are using Visustella's core engine, there's an option in the parameters called Window Settings, look at the options for that and you should see something that says Show Backgrounds near the bottom, just change it to false. It was my first time using MZ and it took me a long time to find out how to do this too. I hope this helped you.