Please, add auto saves after clearing each floor. Seriously.
I've just had over floor clear, and over an hour of progress in the labirinth erased, >>for the second time<< because I've got a call on my android phone while playing, and the game restarted automatically.
I know the blame is on me, but there really ought to be an auto save function on an infinite dungeon crawl mission, where one crash, phonecall, or unassuming click on "rollback" on an error screen can erase hours of progress in the game.