Hey C,
Thanks so much for the additional feedback! We have investigated the issue further, and after the update the Galaxy xCover is no longer compatible with Osmos HD
It is no longer available for this device to avoid performance issues that have cropped up after the update, like the white squares, which detract from the game experience.
If you purchased Osmos HD from the Google Play store, we'd be happy to offer you a full refund of your purchase.
Thank you for your patience and understanding!