It can be a slog to build and release a game like this, so well done on getting it out! Personally, I think it’s quite well polished UI wise. UX wise I guess keyboard input as others have said would be nice. On mobile I really want to drag the letters to re-order them, - but - at the same time it works just fine. We’ve had loads of feedback for https://puzzlist.com/stackdown and I felt pretty overwhelmed so if you feel like that, be encouraged, squint your eyes and see all the positivity from what you’ve made!