I've been in touch with FDG. The games were pulled pending iOS 9 fixes. iOS 9 broke EXE-Create's Kemco-published games so I wasn't surprised these games would be affected. Both games will return to the store once they're fixed up.
unfortunately we had to temporarily remove the iPhone version as it's not running properly on the new iPhone generation (6s / 6s plus) in case you bought the iphone version and can´t access it anymore, i can give you a promo code for the ipad version, so you can still play the game.
Unfortunately we had to take the game offline due to technical issues that cannot be fixed easily. I don't know myself if Across Age 2 will ever come back to the app store, but I definitely hope so. In the meantime, there's still the iPad version live, Across Age 2 HD, which doesn't have these issues. Sorry to be the bearer of bad news...