Ah Don't worry too much about it! I was a hopping I didn't make a too long of a comment on my side, but I'm glad it will help you in the future :) (also I am answring your comments in a less structured way rn cause i'm not on my laptop)
Pretty sure bug fixing is not against the rules.
Maybe have a restart button in the sidebar as well? Since you don't have going back arrows, someone might want to restart the game before finishing it completely, if they picked a choice they didn't like.
Sometimes the simplest way is best, especially when it comes to UI design. Aside from some codex pages or a transition page, I rarely use images in my games. But it is also a style and choice from the author, as some other games will have images that will make sense for the story. Essentially, when it comes to it, ask yourself: does the image/music/add-on make sense in the story? Does it add something to the experience?