Looks good. What's with the submit buttons being put on the left on virtual game keyboards, even though Return/Enter usually on the right on typical keyboards. Wordle also does this.
I struggled with an input box for the first month on my game, Apple and its crazy UI/UX. I think you made the right choice with the keyboard.
Having the backspace on the left would probably mess up most mobile typers' muscle memory, and since that key is pressed once vs backspace which might be pressed multiple times, it would be a sensible tradeoff to keep submit on the left side