I guess this is a device problem. I even play once in a lifetime when I know this is a same creator of eternum and the eternum I can't play this one because of something problem the once in a lifetime game the one no problem it smoothly working no issues.
Did you follow every step in downloading the game if you did then maybe there is a problem with this new update 0.8.5 if you didn't here is a link that can help you downloading it https://shorturl.at/lzFZ0 hopefully you will succeed this time 😁