Pretty cool! Do you have source code available anywhere? I'd love to see source of a smaller app for learning purposes.
You put it on Github, and I'll review the app and suggests code improvements (probably not amazing since I don't do iOS that much, but I know some Swift, and a lot more experience with Go, Java, JS, etc.).
Up to you, but you should never be ashamed of the code if it works. It got accepted to appstore, it's good enough ;).