A default option in Ren'py is to hit 'h' to hide the ui and enjoy the scenery. I've made sure the text will be legible against the background. As well, the text box is highly transparent so as to not interfere too much with the backgrounds itself. I know it looks a bit amateurish, and that's because it is! I've never done anything like this before. The UI may see an overhaul at some point, especially if player feedback is negative upon the first release. I might even give the player the option to choose between different styles and themes. It would be fairly easy to program, would just involve more time making different interfaces. Since I want android releases, I'm going to have to learn how to customize the interface on the fly anyway.
Dont take as anegative, as it is a discouraging term and it makes me feel bad for saything anything.
As for giving the player choices of different style/themes it sounds as a good idea, but this will involve more load on your work. I'm thinking it might require maintenance if you decided to change the layout of the UI, as you will be forced to change all the other sets to match. It's better to stick to one, and make it from your own style.
You cant satisfy everyone with a specific style but if you can impress the majority then that's a winner.
PS: Your voice sounds like one those voice-over actors

nice, collective and clear voice.
PS on the PS: just to clear the air, totally not hitting on you
