Due to a signature conflict that cropped up as a result of building v1.0 on a different machine than the v0.9 releases, players were unable to upgrade the game. To put it simply, a bit of data that's used to verify apps didn't match up between the two versions.

Until we can fix this, 1.0 has been pulled. If you've already installed 1.0, you may want to switch back to v0.9.9 for now so you'll be able to properly upgrade.