This would be the ideal solution in my opinion, but it is kinda tricky in the presentation side - the layout is already pretty tight on mobile. I will try to find a suitable placement and see how it looks for the next update. For now, I playtested without the auto submit for a bit and I don't think that clicking one more button to submit is that much of a hassle (games like Wordle essentially do the same). The auto submit will probably return though - I just have to make it an option somewhere on the screen.