I'm playing on Samsung s6 edge last update Android for that version 7.
1. Is a graphic bug. It's a tiny line on screen black color and it appear in random places on the bottom part of screen.
2. Gameplay bug. Sometimes on 6 or 7 th day bottom panel and left / right bar a stuck. Become unavalible to use. Also like a 2 buttons to pick up and beat they not working. You can only walk.
Really I did nothing. Possible on that lvl I invent few new tools like move ground around.