Not sure what the issue is, but 4.1.1 is up now. See if that version fixes your issue.
I got Problem about can't back out from setting and can't open menu while I'm in the game too, from 1st I'm not So sure that cuz my Phone or the game bug but since i saw this comment thank to him, maybe it's not my device, So please try to check this Problem. Your game is amazing and i love it So much from PC player ^_^ , Hope we will solve this Problem soon <3.
(And my version of this game is 4.1.1 Android)
Thank you ^o^