UI/UX improvements please

The app is great but there are a few UI/UX issues that I have noticed as both a user and a software engineer

- the lack of a dark color scheme is very irritating and makes it impossible for me to use after sundown

- the fact that turning off the app font only changes the hangeul into the system font and leaves the rest as is is quite uncomfortable as well

- when using the native keyboard it gets dismissed after every finish and you have to tap to pop it out again (this mostly applies to when the ranking view is enabled)

- the enter key should move on to the next word or there should be an option to auto continue when succeeding

- the "live view" of what you’re typing below the word is way too tiny and strains the eyes a lot