Hi, in the case of enlarge the images, I don't know what could be causing it. Maybe it could be an issue where the game doesn't recognize the touch properly (I'll try to find something about that because it's a game issue)
As for the background, I just checked and you're right, it looks a little strange, the intention was for it to fill the entire screen, but it looks a bit odd. I don't know if I can include it in this next update, but I've already noted it down to fix it
Thanks for the report 👌